I apologize for completely missing this comment.

8.50 The bigger the bets the less we have to float. Being a SRP pot with high SPR we need to have some hands that make strong pairs on the river and need to protect ourselves on T-J-Q-K-A runouts. The logic is to analyze your range and defend the highest OC with higher frequencies (KQ protects both on a K and a Q river, QJ on a Q and a J). K high hands also have more showdown value if the opponent decides to barrel twice with lower overcards and giveup the river. KQ is basically a pure call, even against pot, KJ, QJ are treshold hands and should be defended as frequencies against bigger bets (pure against small bets). Consider that you also have AJoff in the range here, so KJ is not mandatory to protect your range on a J, and you have KQ so QJ is not mandatory to protect your range on a Q.

26.10 Usually 2 flop sizing makes sense when you can have a pot/overbet + small bet (you can see the solver clearly splits certain categories of hands into one size or the other). In this case I thought the highest EV strat would be to just small bet or go for half pot (but in this case we have to develop a checking range): it's a 3bet pot against ISO, so the BTN's range is going to be tighter and will not include some hands such as KJoff and definitely no QJ JT off. BTN range struggles to connect with top pairs on this board, will have a bunch of AQ-AJ hands which still are not happy on a K high board, and will connect strongly with 77-99. Pot/overbets are very effective on boards in which there are tons of offsuited top pairs, second pairs and gutshots (it's very common in HU on 2 broadway boards). In general we have a strong advantage in the medium-strong part of the range (strong top pairs- AA) and villain cannot really float with bdoors unless they have a GS or are very strong bdoors such as ATs+ and the EV of the half pot strategy was unclear, as I cannot know with absolute certainty what my opponent isolates and how he plays against a 3bet. In situations in which we are up against a not completely clear range I try to go for the lower variance strategy, which is the one that allows me to bet more frequently and keep the pot smaller.