Small 3-bets are fine if you are comfortable playing post-flop and good at getting max value. But they're useless if you're going to miss out on a ton of value by being scared by 5x and 4x.
Yeah obvious bet on turn. 4x,5x are not in his range. Maybe some suited A4,K4. Anyway there are way more Ah, pocket pairs, KQ, stuffs that you can value.
I think river depends on your preflop image. If you 3bet wide you can bet. If you are 3bet range is tighter c/c seems better