1.I agree that dodge and evasion are kinda bad and unreliable, but I guess it's really hard to balance something like that between it being completely op or total waste of points. Even though i spend points on evasion every level i still got hit quite a lot. I believe hit chance might be something between 30-40%.
2. I got skinner to get better evasion bonuses form siphoner leather armor but idk if it helped all that much, but I believe that shotgun builds are the best builds to include gun nut, mainly because their max dmg range is already quite big, especially on short vindicator I was using (58-235). If its about grenadier, short vindicator (55 degree spread) acts quite well as aoe attack with hopper shot (20 pellets), i regularly get triple kills on rathounds groups.
3. I agree that my build kinda lacks on crafting, but didn't really felt it on normal, got enough to craft jumping bean (+25% to evasion and dodge) but low dex made it a chore to fish for ingredients. Will probably pump crafting and throwing as you said.
4. With 10 agility, specced paranoia initiative, and root soda (+5) I have 33 initiative so i think its enough to act first 99% of the time, but crafting some stealth leather armor and getting cloaking device might be a good choice. Even with evasion being poop i still evade something so shields feel like they are ~40% more durable and overall better on this build.
I also always carry a pistol cause crippling strike (-2 strength) makes my hitchance drop to 10%, but then i can use hopper shot and have 20 shots trying to hit which results in ~88% chance to at least hit 1 shot, so i guess it's not required, but recommended. I will probably start carrying a hornet around for those snipers that i can't run up to.
Thanks for the response!