When picking up hands like aj+ with 20bb I seem to be getting in the same spot where I open, villian flats in bb and flop comes 776 789 569 type boards. I continue on these flops and villian flats. once again I lead on the turn and get called. This leaves me in a very awkward spot on river where I'm left with a 3 quarter pot sized bet. what lines do you guys take in these spots? How should my line differ if I make a pair on turn or river?