Playing a sex slave model I found I didn't have much trouble maintaining Mental, and when it did get depleted a little socialization with other Synths fixed it.
On the other hand I had a lot of trouble with health, since any kind of combat chips away at it and you can only get a small fix at the clinic once per day. Even when spending huge amounts of money on fruit bowls and vitamins, one trip to the under city and a few encounters with those damn boxing bots wiped out any headway I made.
I really like what you've got so far though. I'm gonna be keeping an eye on this one.