Hi, as far as i know there is no max on crit, but if you want to go pvp. You have to considure that ppl have resilions. So what i normaly have been doing is to only push dmg untill i fell that i have the dmg i need to down someone with the time my resilions and hp gives me, without criting. And then start to push up crit. As now after s1 is bought for honor most ppl you will meet in arenas have 300+ resilions. So you better have a nice pure dps, And not relay on crits. Unless you really do the opposite of this and only push crit to the limits that you know you will crit so much that criting itself will get the job done.
Anyway. About the + hit, know that in pvp, there is a limit of +75 hit rating on both melee and spell hit rating.. All above that is not giving anything in pvp, but works in pve only.. So dont worry much about the +hit for pvp aslong as you are epic geared you should have that covered. And, you harld never miss unless they are using a counter ability vs you..