[Wynton]

Hand 1. We have no read on sb, but because he 3-bet pf, it's reasonable to assume he has at least 88+, AK, AQ or perhaps KQs.

I believe capping pf is perfectly reasonable; in fact, I think it's the default action without a read.

The post-flop problem is that, once you check the turn, you can't be sure that sb isn't betting the river with something like 10s or 9s, not out of a bluff, but because he believes his hand is actually best. Since he is an unknown, I have enough doubt about his hand to call the river bet. Don't think I like the river raise, because he'd probably fold with a worse hand and is not going to fold a better hand.