Most likely a reg for me to have 4b here

A5s falls into my 4b range here and since Im up against a reg (where they tend to have wider linear ranges here), I figured id 4bet.. could maybe be a bit bigger due to our stack sizes

Reasonable board to cbet, we should have the advantage here mostly, seeing that there arent too many sets that could have flopped with his line.

I figured im giving up this turn a lot with missed AK that dont have spades. Seeing that my 4b range here is KK+, AK, KTs and A5s, I would choose to bet almost all of my A5s as semibluffs, as they still have eight outs to improve and Id play KK+ the same way.

We pick up SDV to beat some of the FDs that have got to this point, but theres still more overpairs in his range than that. However, I wouldnt expect 99-TT f.e. to jam but more like JJ-QQ or slowplayed AA (KK sometimes being jammed more often PF). Next to that, he could be jamming missed FDs that we unblock and block some of the AA he could have slowplayed. But maybe population is too honest in 4b pots and bluffcatches like these shouldnt even be considered.