Hi Jeff, I agree in the 69o hand, a bigger XR serms better, and our hand wont fit there. Anyway, as you asked, I think many players overfold to xr, usually after betting small, and raising small with merged hands is a fine exploit against this imo.
KQo is easier I guess. Almost on any texture, when we face small sizings we need a bunch lf raise, as OOP and also as IP. In dry textures people struggles a lot to find the right calling frequencies, so against many players we can raise as a bluff more than optimal, and of course sometimes raise a hand like KQ, ehich is extremely strong in BvB.

In the KJo hand, it looks like Im overbluffing here pretty often if im not careful, I have like 8 value combos, so bluffing only Half of KJs/QJs should be enough. On the other hand, expect population to overfold a T quite often vs a triple barrel given how pool plays, so thats a point to bluff more than optimal.
I think habing a Jc is a bad blocker, because he might have a couple JcXc that we beat at this point

Usually it depends on the oponnent.
Lets say I have a mix between calling and check-raising with some gutshot. If my oponent has a high fold va xr, I’ll raise. If my oponent is balanced, I might run a RnG. If my oponent underfold vs XR in not going to use this type of hands as a xr bluff.
The closer to GTO my oponent plays that soot, the most I want to play as a solver, and if necessary Ill use a rng.
The biggest is the deviation between how is my oponent approaching that spot in comparison with a solver, the most I give a shit about frequencies and I go for the explo option