Have you got any 3bet/squeeze stats on these players as well as fold to 3bet? At first glance I don't think I like folding with no information. He never (<1%) has KK/AA so you are therefore giving him credit for JJ/77/6x. That is so narrow and given that its such a big pot, I'd call.

I would just fold turn, I do not think he bet 88-TT on the flop very often and continues to bet for value on the turn. Congratulation to him if he bluffed in a 4-way pot.

I prefer to check-call on the flop I do not think any worse gives us value if we raise. Our flop call have to make him worried if he have 88-tt, and he would probably check back the turn.

Anyways I know you did not ask for this but preflop I would 4-bet or jam all in, BB is extremely loose , CO VPIP and PFR is pretty far from one another so he is pretty callish with suited connectors, suited aces etc. You really want to isolate with big pairs since they play much better heads up.