q1)
i'll call 4x raises with unsuited connectors if the player raising is particularly bad, or if there is already a cold caller.

q2)
i think 3betting light preflop is much more +EV than trying to steal it postflop. they do have position on you.

q3)
against this villain, it's fine. i would cringe too putting in a 4bet with AQo. and yes you have to fold. who 5bets light anyways?

33% sounds about right for a VPIP of 25.