Several (60 to be precise) Robot mods with the Rust Devil aesthetic list a carry weight reduction in their description, but are missing the effect:
Assaultron
DLC01Bot_Arm_Assaultron_Armor_Wasteland03_Left "Left Arm Cruel Spiked Plate" [OMOD:0100F8C1]
DLC01Bot_Arm_Assaultron_Armor_Wasteland03_Right "Right Arm Cruel Spiked Plate" [OMOD:0100F8C9]
DLC01Bot_Arm_Assaultron_Armor_Wasteland04_Left "Left Arm Wicked Noxious Plate" [OMOD:0100F8C2]
DLC01Bot_Arm_Assaultron_Armor_Wasteland04_Right "Right Arm Wicked Noxious Plate" [OMOD:0100F8CA]
DLC01Bot_Arm_Assaultron_Armor_Wasteland08_Left "Left Arm Barbaric Spiked Plate" [OMOD:0100F8C6]
DLC01Bot_Arm_Assaultron_Armor_Wasteland08_Right "Right Arm Barbaric Spiked Plate" [OMOD:0100F8CE]
DLC01Bot_Arm_Assaultron_Armor_Wasteland09_Left "Left Arm Merciless Toxic Plate" [OMOD:0100F8C7]
DLC01Bot_Arm_Assaultron_Armor_Wasteland09_Right "Right Arm Merciless Toxic Plate" [OMOD:0100F8CF]
DLC01Bot_Arm_Assaultron_Armor_Wasteland10_Left "Left Arm Warmonger Serrated Plate" [OMOD:0100415D]
DLC01Bot_Arm_Assaultron_Armor_Wasteland10_Right "Right Arm Warmonger Serrated Plate" [OMOD:0100415E]
DLC01Bot_Legs_Assaultron_Armor_Wasteland09_Left "Left Leg Merciless Serrated Plate" [OMOD:0100F8DF]
DLC01Bot_Legs_Assaultron_Armor_Wasteland09_Right "Right Leg Merciless Serrated Plate" [OMOD:0100F8E3]
DLC01Bot_Legs_Assaultron_Armor_Wasteland10_Left "Left Leg Warmonger Serrated Plate" [OMOD:01004162]
DLC01Bot_Legs_Assaultron_Armor_Wasteland10_Right "Right Leg Warmonger Serrated Plate" [OMOD:01004163]
DLC01Bot_Torso_Assaultron_Armor_Wasteland03_Rear "Rear Cruel Spiked Plate" [OMOD:0100F8D5]
DLC01Bot_Torso_Assaultron_Armor_Wasteland04_Front "Front Wicked Spiked Plate" [OMOD:0100F8D1]
DLC01Bot_Torso_Assaultron_Armor_Wasteland04_Rear "Rear Wicked Noxious Plate" [OMOD:0100F8D6]
DLC01Bot_Torso_Assaultron_Armor_Wasteland07_Rear "Rear Brutal Spiked Plate" [OMOD:0100F8D9]
DLC01Bot_Torso_Assaultron_Armor_Wasteland08_Front "Front Barbaric Toxic Plate" [OMOD:0100F8D3]
DLC01Bot_Torso_Assaultron_Armor_Wasteland08_Rear "Rear Barbaric Serrated Plate" [OMOD:0100F8DA]
DLC01Bot_Torso_Assaultron_Armor_Wasteland09_Front "Front Merciless Serrated Plate" [OMOD:0100F8D4]
DLC01Bot_Torso_Assaultron_Armor_Wasteland09_Rear "Rear Merciless Toxic Plate" [OMOD:0100F8DB]
DLC01Bot_Torso_Assaultron_Armor_Wasteland10_Front "Front Warmonger Serrated Plate" [OMOD:01004164]
DLC01Bot_Torso_Assaultron_Armor_Wasteland10_Rear "Rear Warmonger Toxic Plate" [OMOD:01004165]
Protectron
DLC01Bot_Arm_Protectron_Armor_Wasteland01_Left "Left Arm Cruel Spiked Plate" [OMOD:0101030D]
DLC01Bot_Arm_Protectron_Armor_Wasteland01_Right "Right Arm Cruel Spiked Plate" [OMOD:0101030E]
DLC01Bot_Legs_Protectron_Armor_Wasteland01_Left "Left Leg Primal Plate" [OMOD:0101031A]
DLC01Bot_Legs_Protectron_Armor_Wasteland01_Right "Right Leg Primal Plate" [OMOD:0101031C]
DLC01Bot_Legs_Protectron_Armor_Wasteland03_Left "Left Leg Cruel Spiked Plate" [OMOD:0101031B]
DLC01Bot_Legs_Protectron_Armor_Wasteland03_Right "Right Leg Cruel Spiked Plate" [OMOD:0101031D]
DLC01Bot_Legs_Protectron_Armor_Wasteland09_Left "Left Leg Merciless Serrated Plate" [OMOD:0101011E]
DLC01Bot_Legs_Protectron_Armor_Wasteland09_Right "Right Leg Merciless Serrated Plate" [OMOD:0101011F]
DLC01Bot_Torso_Protectron_Armor_Wasteland06_Front "Front Merciless Hardened Plate" [OMOD:01010310]
DLC01Bot_Torso_Protectron_Armor_Wasteland09_Front "Front Merciless Toxic Plate" [OMOD:01010311]
DLC01Bot_Torso_Protectron_Armor_Wasteland10_Front "Front Warmonger Serrated Plate" [OMOD:0100418C]
RoboBrain
DLC01Bot_Arm_Robobrain_Armor_Wasteland02_Left "Left Arm Grim Spiked Plate" [OMOD:0100FD3E]
DLC01Bot_Arm_RoboBrain_Armor_Wasteland02_Right "Right Arm Grim Spiked Plate" [OMOD:0100FD3F]
DLC01Bot_Legs_RoboBrain_Armor_Wasteland04_Waist "Treads Mid Wicked Serrated Plate" [OMOD:0100FD4D]
DLC01Bot_Legs_RoboBrain_Armor_Wasteland10_Waist "Treads Mid Warmonger Serrated Plate" [OMOD:01004F3A]
DLC01Bot_Torso_RoboBrain_Armor_Wasteland02_Back "Rear Grim Spiked Plate" [OMOD:0100FD4F]
DLC01Bot_Torso_RoboBrain_Armor_Wasteland02_Front "Front Grim Serrated Plate" [OMOD:0100FD52]
DLC01Bot_Torso_RoboBrain_Armor_Wasteland10_Back "Rear Warmonger Spiked Plate" [OMOD:01004F3B]
Sentry Bot
DLC01Bot_Arm_Sentry_Armor_Wasteland05_Left "Left Arm Sinister Serrated Plate" [OMOD:0100EB46]
DLC01Bot_Arm_Sentry_Armor_Wasteland05_Right "Right Arm Sinister Serrated Plate" [OMOD:0100EB4D]
DLC01Bot_Arm_Sentry_Armor_Wasteland08_Left "Left Arm Barbaric Serrated Plate" [OMOD:0100EB47]
DLC01Bot_Arm_Sentry_Armor_Wasteland08_Right "Right Arm Barbaric Serrated Plate" [OMOD:0100EB4E]
DLC01Bot_Arm_Sentry_Armor_Wasteland09_Left "Left Arm Merciless Spiked Plate" [OMOD:0100EB48]
DLC01Bot_Arm_Sentry_Armor_Wasteland09_Right "Right Arm Merciless Spiked Plate" [OMOD:0100EB4F]
DLC01Bot_Arm_Sentry_Armor_Wasteland10_Left "Left Arm Warmonger Spiked Plate" [OMOD:0100EB49]
DLC01Bot_Arm_Sentry_Armor_Wasteland10_Right "Right Arm Warmonger Spiked Plate" [OMOD:0100EB50]
DLC01Bot_Legs_Sentry_Armor_Wasteland03_Left "Left Leg Cruel Spiked Plate" [OMOD:0100EB57]
DLC01Bot_Legs_Sentry_Armor_Wasteland03_Right "Right Leg Cruel Spiked Plate" [OMOD:0100EB5D]
DLC01Bot_Legs_Sentry_Armor_Wasteland03_Waist "Mid Cruel Spiked Plate" [OMOD:0100EB62]
DLC01Bot_Legs_Sentry_Armor_Wasteland06_Left "Left Leg Savage Serrated Plate" [OMOD:0100EB59]
DLC01Bot_Legs_Sentry_Armor_Wasteland06_Right "Right Leg Savage Serrated Plate" [OMOD:0100EB5F]
DLC01Bot_Legs_Sentry_Armor_Wasteland09_Left "Left Leg Merciless Spiked Plate" [OMOD:0100EB5B]
DLC01Bot_Legs_Sentry_Armor_Wasteland09_Right "Right Leg Merciless Spiked Plate" [OMOD:0100EB61]
DLC01Bot_Torso_Sentry_Armor_Wasteland09_Top "Rear Merciless Toxic Plate" [OMOD:0100EB64]
DLC01Bot_Torso_Sentry_Armor_Wasteland10_Front "Front Warmonger Spiked Plate" [OMOD:01004169]
DLC01Bot_Torso_Sentry_Armor_Wasteland10_Top "Rear Warmonger Spiked Plate" [OMOD:0100416A]
Other Rust devil mods either reduce the carry weight as stated, or are storage mods with an increase in carry weight. Only exception to this being a handfull of Sentry leg armors, which stagger/knock down enemies; which are carry weight neutral.
Porposed fix: add the carry weight reduction