There is at least one problem - if you take chem guns for their effects, then they won't work without Mad Chemist, because it doubles chance to proc these effects.
If just for +50% elemental damage, then fine.
I still think that Deadly Snares is an overkill, but actually it was for Hard, not sure if it's overkill now with +50% hp.
Anyway, you have no room for it, or you can take it very late in game, I think you'll reconsider about it, so don't pour skilpoints in Traps more then needed for QT.
If you want to make trapsless detectable, bear in mind that if you set trap around the cornet, even if you have 0 skill, most likely NPC trigger trap because he won't have time to detect it. Also, in a fight they detect traps very badly.
Paranoia is quite useful, especially with that huge amount of Per.
On Domination everyone who has stealth, has good stealth.
Also, my advice - don't go to Lurker territory early on, and even later, they tear you apart without good firepower, or good defence or good crowd control.
I can't even reliable hit them without reloadfest on 15 lvl with 10 Per.
Edit Wait, I misinformed you. Without Mad Chemist damage of the on-hit effects will be 1/2 right?
Or what? I'm a little confused.