Check raising the turn is a very standard line for a a lot of players with set, so standard that you won't stack a decent opp's TPTK.

1st hand.
Raising PF if you first in is a good start (more so in 6-max). As played your on the right line with leading, If your raised then you have many options to build the pot (3-bet, lead turn, ck-rs turn) which you can alternate according to the situation and to stop players getting a read on you. If you take a similar line with strong draws it will mask your overall play even further. Also, going back to the hand, if the third heart falls before you get the money in, it could kill your action.

2nd hand.
Its going to be very tough to win a big pot on that board, one way to help this would be to raise to about 12BB PF. You have announced your hand without charging for it. Any PP is getting great implied odds to out-flop you and as most hands will fold the flop, you need to build the pot while you can. On the flop I'd just lead and expect a fold.