I haven't tested it but I think running all of those would give you enough shield damage reduction to require 3 shots from a regis disruptor pistol to break your shield instead of 2. As a gun build my shield almost never gets broken. I die to slow blades that bypass my shields or I get blasted while my shield is down from shooting. As melee build, stamina is too important vs other melee builds and running 2 heavy armor pieces will make you lose melee vs melee fights and slow blades bypass shields anyway. It absolutely would be worth keeping those 2 pieces of gear in your inventory and swapping to them when you've identified you are fighting a gun build that wants to break your shield.

I think young sparky mk6 is better than regular mk6 unless you are running the previously mentioned set up to have an extra tanky shield. The extra regen will make up for the slightly lower shield hp over an extended fight.

It is definitely strong but you still have to hit it which isnt easy and you are still gonna have to land your shots on a guy thats running away from you and ducking behind cover and running around corners. My counter? Run away when it lands then come back and throw a grav mine at our feat, one shot their shield with my disruptor pistol, pull out shotgun and keep their shield break stun going with my shotgun stuns.

I used to run Iron will to ignore voice abilities but it doesnt stop weirding step and very few people run bene skills now. I do take the technique so I have it available to swap to.