I don't hate your line in that T9 hand, though I'd most likely just call in position, especially without any flush blockers (not that it's crucial but in poker, every little bit of advantage helps even when we're talking marginal card blocking effects). As played that 8 on the river is kinda terrible because it doesn't help you rep anything and it likely won't scare away the villain who called the turn on a real scare card. I'd likely skip the river bluff on this particular river.
I don't like the bluff in the hand number two. You can definitely defend your decision to call the flop, but I don't see many NL4 opponents going anywhere once they committed to two bets on a monotone board.
Once again sir. I'm glad you're back and I can't wait for future updates.
EDIT: I was referring to the last two hands posted in this thread btw, the ones in the last post on the first page.