Hi, so I've been getting called down a lot in similar situations to this hand. I'm starting to feel like I might be making some mistakes, because in this case, like many others, I think that there aren't many combos of bluffs that I have, yet I still get called by hand that even blocks those few bluff combos.

Villain in was playing 4 zoom tables, so I assume they are a reg; I don't have any other reads. A couple of other questions: 1) What does your bluffing range include in this line? 2) Do think sizing is okay or do you think jam would be better?