Folding river in hand 2 seems pretty weak unless you are pretty sure he only has sets here. Especially with his higher river aggression and it sounding like he keeps firing often and you thinking you fold too much. Check flop to get action from his weaker hands right? Isn't this what we wanted?

Board: Ad 5h 6c 5d 3d
Dead:

equity win tie pots won pots tied
Hand 0: 57.895% 42.11% 15.79% 8 3.00 { AcKs }
Hand 1: 42.105% 26.32% 15.79% 5 3.00 { AA, 66-55, AQs+, AQo+ }