Should have I dropped

[alieneyes]

Well unless you know a bit about UTG+1 I'd be more likely to limp pre-flop with 66 as generally he's showing a bit of strength here. If however he does this all the time, then fine, pop it. The raise to 600 makes it hard to take down immediately however since there is already 1100 (not counting the BB call yet) in the pot when it comes back to him and it only costs him 400 more to call. When the BB calls as well he's getting 4:1 against two stacks that can hurt him but not critically wound him. The upshot is I probably would have raised more, to atleast 800 to try and shut out the blinds better and make it more likely he'll fold. Now, that is over 25% of your stack - more reason just to limp pre-flop.

On the flop I think your bet is too weak - there is 1900 in the pot now so your bet is about 25% of the pot (he's getting 5:1 with a pair, an overcard and a back door flush plus you look weak) - you pretty much need to check or go all in. I'd probably just check against two opponents. Against one its a tougher call.

On the turn its all in or check again I think. I think the BB's play is pretty bad here - he should either bet into or check raise you all in I think (after the turn but you only have 1450 i think).

On the river I think you're pretty committed.