Villain plays 21/15 365 hands. Cb 64%.

Is this too light then what is minimum here, or is it ok? As played i guess i should triple barrel?

I think flop c/r is ok you have lot of value hands K7s KT 7Ts 77 TT maybe you have some better bluffs like 9Js J8s 68s 78s 79s
AP-turn could be a c/r let him bet/fold QJ (16combos) 89 he probably checking beck naked Kx which is good for you because he dose not fold that anyway.I think KT 3bet this flop a lot so c/r could be really good move in this spot.
River is ok to give up he have a K or better a lot but he can have some draws if he hero calls you with Tx take a note

That's a 2bet on the flop, not a 3bet, and it's terrible, if you raise this hand then your raising range will be massive, or you're just picking random hands to bluff sometimes.

I really hate the x/r OTF. Since we're capped pre and don't have TT or KK we have to be very careful about selecting our x/r bluffs. Selecting this hand as one of our bluffs makes little sense as we have so many better bluffs, things like 98s Q9s 96s 86s. If we start x/r A8s, a hand that is supposed to be one of our weaker floats on this texture, then we are overbluffing like crazy here. To adapt to a slightly high cbet% like this just add in some more floats and find x/r's OTT or river, don't do something ridiculous like turning one of those good floats into a bluff.

after the x/r though I think tripling is our only option with this particular hand and we should have gone bigger OTT. Most of our hands that double barrel bluff are things that have no blocker on Villains strong Kx or AA. However, A8 actually does have blockers to villains value range so it's a better canditate for a triple. Villain certainly has a lot of Kx but also has things like QJ, 98s, Q9hh J9hh J8hh and possibly some ThXh if hes a fish. assuming we don't double barrel with our ace highs OTT without the FD then this is one of our best hands to triple with so we kinda have to (idk maybe you are x/r AJo or something OTF in which case you have better bluffs than A8hh).