1) Standard. Go for broke there every time.
2) Turn bet should be closer to pot, at least 3/4 Charge the flush draw if he has it...
3) PF is kinda stupid, but you were fine there. Flop is standard. Of all the river spades to come...
4) Villian must have been the Nit of all nits. I pot the turn and push river... I'm really only worried about 78, which really should raise the turn, as should TT also... whatever.