There are two feats that do almost exactly the same thing: "Doctor" and "Fast Metabolism".
Both add +25% to healing effects. Since effects stack, there is no inherent problem with the fact several feats like that exist.
However, as of right now, "Fast Metabolism" is just plain better most of the time: it effects more things (i.e. healing from healing vest is also effected) and, on top of that, it also boosts you psi points recovery from psi booster.
Doctor, on the other hand, only allows you to use bandages under 40% health: useful, but hardly actually game-changing, because it still only works out of combat. And out of combat you might as well wait for hypo cool-down.
So I was thinking: let's, maybe, buff "Doctor" a bit? Say, make it also double the range where natural regeneration kicks in (out of combat): from 85%+ of HP to 70%+ of HP. That way "Fast Metabolism" will still be better for in-combat healing, but doctor will have a more clearly defined niche (resource-efficient out-of-combat healing).