Would like to know more info on villains. It's hard to say when you give us so little info, so I'm just going to give you my default against an unknown.

1) fold or 3b pre (weighted heavily on folding pre until we know a bit more about UTG). Fold to SB 3bet. If you say the guy is tight UTG and he's getting 3bet, then sb would probably have a pretty strong range and is 3betting for value. What was your reasoning behind both your calls pre?

2) hand 2 depends a lot on villain. Against an unknown I'd b/f small on the turn. It's thin, but a lot of his hands that floated flop would have caught overs + gutter. Would probably then c/c a brick river. c/c turn is okay but these spots really depend a lot on villain.

3) Pre depends on table dynamic. ie. fish in the blinds, nits to your left, etc etc. As a standard I'd fold pre. I think c/f>b/f in this spot. Turn isn't a great barrel card since it is unlikely to help our range. We're probably not going to get paid off by much when we hit our straight since it's hard to get value on 4 straight boards. And w/ b/f we're really maybe folding 99-TT and air (which we don't know since you didn't tell us how often he folds to cbets), since most of his 7x hands would have turned a draw or 2p and Kx isn't folding. Since we don't have much fold equity and when we hit it'd be hard to get value, I'd just c/f.

4) Fine imo. Pre again depends on table dynamics. I find that as a standard, A9s is the bottom of my Axs opens from MP until I develop further reads. I find that when fish bets the same/similar amounts on each street it tends to mean that their hand strength haven't changed. We only need 17% to break even, and I'm sure there's worse hands that villain has in this spot so it's an easy call.