[X] Add additional signature reduction: You already have pretty good signature reduction but this would bring you up to the level of a tac sleeve, at least if you aren't dressed too heavily.
[X] Add additional skin sensors: provides additional sensory systems and turns your whole skin into an antenna to detect hostile scanning and the like.
[X] Add subdermal armour: Provides you with light armour no matter what clothing you're wearing. Of course, if you're wearing armour as well, you'll get double the protection.
[X] Add additional damage control: Creates additional emergency systems and redundancy within your body that will keep you alive, even if heavily wounded.