KK - SB 3bet vs BTN

Range bet flop for 1/3. His raise sizing is not optimal, you can prly just ship it, as these raises are eq driven therefore you can fastplay. Vs standard raise you should usually mix overpairs between calling and reraising (not shoving most of the times, minraise is used). Stronger the overpair is, more incentive there is to just call. IP shouldnt be raising much, basically only calling/foldin vs cbet as zeto pointed out. On this board pio prefers to just raise most of the OP, so you can just ship it OTF. Fold is atrocious. 20+bb blunder. Hes got AJ which u heavily dominate and plenty others.

The 40 and 33% make a big difference on flop in terms of how wide raise range is
has to do with SPR on turn I guess

I've never played that cbet size might be interesting to figure out why that is

I haven't used 40% in a while so can't comment on that, but I use bigger 3b size preflop, so my 33% cbets generate simillar spr to the one in this hand, so its kinda hard to believe that raising will be happening with higher frequencies. From what Ive seen its more about board texture. And this one is damn good for oop, you can just range cb and start thinking of your actual strategy OTT. Axx boards gets to raise certain percentage of the time, but as a rule of thumb (and for micro stakes playa) its much easier not to have raising range ip imo.

No need for that, just flop 3bets is enough to have a decent idea.