The line looks ok.

I think T8s is a strong enough hand to call versus a CO open though, would be slightly better if you used a hand that isn't a profitable call for the 3 bet bluff. It's super close though.

Bet sizing I'm not 100% sure about. Maybe you have two options bet 21 on the flop and if you get one caller then you can shove the turn if you want. Or bet smaller on the flop multiway intending to barrel small on some turn and river cards. Interested to hear what the stronger players think on that.

Yeah prefer calling to 3b and multiway I'm checking this flop, typically one villain will have abhand to call here and although a bet isn't necessary -EV we are probably better seeing more cards for free so that we can be sure a T is a good bluff catching card. Betting may be better however, close enough to not worry.

Check the flop, not much good can come from a bet, if we get raised we fold and if we get called, we're not loving life as we have T high.

Pre I think is fine, flop should be a check back and see a cheap turn card. The pot is already big enough that by checking the flop we can still bet the turn (if we hit) and shove river easily.

Ok, thank you guys, much appreciated as always.