[betgo]

I actually don't know if 3rd is that bad given the position. AQ3 with a 2-flush As and Qs live is not that much worse a hand than 3 low cards or a low pair with a low card, which is probably what the 7 has. The raise is typical donkament style, trying to bully with the ace door card. The standard play is to fold. I kind of like a limp behind better than a raise.

On 4th, you caught good, but you are still semibluffing, and you got two callers on 3rd, so I might just check/fold.

On 7th, I would check/fold. Villain called on 4th when he caught a high card and you caught a low card, so he probably started with a pair and had kings up. Villain is not folding, and probably is not betting a weaker high than yours.