Is capping PF w/QQ the best idea? I think just call the 3-bet. ("I think" being the operative phrase there).

I'm most concerned with UTG+1, but I don't know his previous plays. If he's solid and cold-calling all of that, I'd worry that he hit his flush (though he isn't getting pot odds... maybe he hit a set on the flop? But why would he call the PF cap with a medium PP and only two players? Maybe he's just fishy and you can mostly ignore him). Don't know what BB has, but he also appears scared of the flush.

Having an over-pair, I'd guess you should bet/call the river.

(oh wow, this is microlimits. I really wouldn't worry about UTG+1 then, and also not so much about capping, I suppose.)

I think you have the best hand here.