For the first hand I really like your line. Initially I thought villian was on a flush draw with two overs, but based on your read he probably would have pushed the flop, so he either has a monster or nothing. The only hand I'd be worried about here is 88. Well played.

For the second hand I don't like your line. Why not just go with a check/call line? There are no draws out, so no need to worry about villian semibluffing. You have a good but not great hand, so why are you trying to jam the pot with a check raise? Without reads, I would look to showdown with AJs as cheaply as possible. No need to inflate the pot when all you have is TPGK.