1st hand I think is really read dependent. BTN overcalled two streets so if anybody can have 6x in his range it would likely be him. If he's good, he shouldn't really ever have a set, making the strongest hand that's not a straight he can hold 2 pair.. I could see somebody good overcalling A4hh or A5hh in this situation. You can't even beat those. All you beat is 9T turned into a bluff, I think you gotta fold this one.

Hand 2... There's nothing you can do but toss it IMO. 200bb deep against a good player w/ a 1 card open ender and a T high flush draw. It's a very high reverse implied odds spot. He won't put any more money in the pot the times you hit your hand unless he hits a better one. It's a limped pot, you have ten high and less than 1/10th of your stack invested, just let it go.