This is a re-upload of SamSWAT’s Duty Exoskeleton mod, seeing that he stopped updating it, with some extra customization.
You will find a config.json in SamSWAT-DolgExoS2 where you have 3 options:

weightReduction - how much to reduce weight, default is 10 kg

exoskeletonArmor - the armor level of the exoskeleton, default is 3.

vestsBlockArmor - do not allow armors to be worn with vests (default behavior of EFT). This a convenient way to allow the exoskeleton (since it’s an armor) to be worn with vests. Default false, meaning do not block.

How to Install: Extract to your aki installation folder, under user/mods.