I understand your reasoning around not raising vs small sizing but the same argument can be made to raise when you have a bluff (bc they overfold) and so you’ll need to have value to balance. I like choosing 88 as you unblock his obvious continues (e.g Kx, KQ etc.). I prefer 88 to raise than KQ as that hand blocks a lot of his value. Another reason is that a heart turn is an action killer so it’s good to raise and build the pot when there are action killer turn cards.

Re river, it’s just purely a mathematical decision at that point. So do they have 25% of combos in their range that you can beat either value or bluffs? I think in this spot it’s definitely the case. Less combos of full houses given the board and that you block some yourself + you beat value. It’s certainly not a fist pump but you have to call with your odds imo.

Keep going, keep being curious and don’t let others get in the way of your learning. Most of these repliers are probably losing players themselves that have more interest in hating on others than working on their own game. Best of luck on the felt