Hey there ^_^
Seems you're going in the right direction (stacking shield stats rather than defense chances) with your mitigation, you could have slightly more accuracy, but you're doing just fine on it. As far as your health goes, when you say "unbuffed" do you mean stims, etc? You should always have your 5% up, so I'm curious if you mean you have 14.5k with the 5% or you mean just naked (literally no buffs).
Also, as for your spec, there is no reason to take gut what-so-ever. If anything, that 1 point (I'd prefer two, it's what I do) should be in either the Stockstrike damage buff in the first tier of the assault tree, or in Energy Blast.
As far as my experience anyway, you seem to be on the right track besides gut, and are doing plenty well with stat allocation.
What kind of gear are you in, set wise? How much of the set? All this information is useful
Also, intoxicated from the night before, and no sleep. Sorry for poor grammar.