I havent studied 4b pots much and id like to share some thoughts here.
What needs to be said is that villain tried to bluffcatch me a few hands before this one and lost his stack, so maybe that also has some implications.

Preflop im first of all not even sure what to flat. Think his bigger 3x sizing and our deepness should have a big influence.

Thats what I went with now, a bit looser than I would but I tried to accommodate for our deeper stacks.

Us having the Ad blocks some of his tricky check backs with aces in theory, but I would expect that he sometimes still checks back other aces here to reraise when we bet. OTF I think we could probably bet, since it is the worst FD of the Axs range and solver likes to bet those usually.
On the other hand, due to the potential trappy-ness, I elected to check so I can comfortably call on the turn and reevaluate further streets.

Turn I think he can stab his entire range with this sizing, be that aces to trigger protection raises from our PP or just his bluffs like AK/AQ, whatever he has. Id rather call here instead of raising because if he reraises with a slowplayed KK/AA id hate my life calling it off (or folding).

OTR I would assume he continues betting most of his value hands. I dislike turning FDs into bluffs as theory suggests, but cannot imagine it would be too bad here to fold out his better SDV, since hes supposed to sometimes bluffcatch with AK.