i would call and just c-c river unless he overbets or something

edit - 1. i don't know for sure but i would be surprised if flatting isn't fine without some knowledge of his tendencies in 3b pots

2. i would definitely c-c based on your description of the match.

3. i would never call turn/fold river unless he bets v big as i would assume he's v-betting all Ax hands when checked to + it's a spot i would assume he could be bluffing. i don't know if it's a good bluff spot for villain or not based on maths but i think it's a spot where most people's bluff frequency will depend a lot more on history and levelments than game theory.

Opens some 85%
70% cb flop 3/4 vb turn 1/1 rvr.

9/11 NL20 6M *PRE* -flat 67o, TJo... *3B* -saw me 4b fold *POST* -lead 67 on TT6 -barrel weak tp on A over rvr -peel on overcard fold rvr -check down KQ J9X as pfr

Match was pretty aggro at this point but we don't play much postflop I cr flop give turn couple times 3b a lot 4b fold and he 3bets some 24%.

Questions:
1) He calls some 35% 3bets rarely 4bets => Do I have to always 3b pre or is both flatting and 3b ok?
2) What's the optimal flop play? just standard cc, we are ahead of his range he will barrel hands we hit... Or would you c/r with a ton of cards we will continue bluffing on? I guess leading is not good as he will cb close to 100%
3) What's your plan on this turn card, can do anything else but call turn fold rvr? Is it a good 3barrel spot for villain since he has a lot more 6x hands than we do in his range?