In the A9 hand that was my first 4bet. AQ was obviously for value when the guy 3bets 10%, and that's not even accouting for postional adjustments.

I managed to finish off the day at -5.5 buyins instead of the doomswitch 7 I mentioned earlier.

How am I supposed to defend against crazy 3bettors if I never 4bet?

FWIW that A9 open in MP was due to balance the fact I had been super nitty the last few orbits.