It's hard to put a silver bullet number on it. I have multiple no-CP non-shield builds that I run 0 impen and it works alright, but I do it at the risk of occasionally exploding in an instant.
Honestly the ideal would be 7 impen but as you said other needed stats are in rare supply in noCP.
Looking for opinions on no-CP BGs when using 7 tri-stat glyphs with purple food on a semi-hybrid build. Hence, extra resources all around would be nice but crit-resist is just too important to ignore.
Would it be better to go 5/2 impen/infused or a full 7 impen? Would the extra crit resist for the final two pieces make that big of a difference in terms of crit damage mitigation?
Looking to be tanky but resources are a luxury in no-CP as well.
People with zero impen must be the people who I feel a little guilty about killing so fast. Well-fitted is fine if you're running impreg, if not, impen on everything.
I have all divines and infused gear on my lowbie and been doing well in bgs. Its not necessarily needed.