Kanu

You're pretty much there. The best way to think of it is that you want to block villain's calling range as much as possible when you bluff. The more you block his calling range, the less likely he is to have a hand that he calls and therefore the higher EV your bluff has. In this case villain's (my) calling range will contain a lot of K5/K4 so having a 5 or 4 is a good hand to bluff.

Pretty good analysis, x/r ranges on earlier streets would make my river range a little weaker as Ben mentions. Given that calling here vs a GTO estimate strategy seems to cost only 2-5bbs or so. it would prob have been interesting to discuss how that EV changes if the baron were to bluff 1 combo too many or 1 combo too few for this very large size. Don't think I'm giving too much away to say that I decided to call my hand 10% of the time but the RNG screwed me over :)