Raising the flop is best, folding the flop against a player with those stats is in my opinion quite weak/tight play @1/2.

I would fold to a 3-bet. If he called my raise and the turn was a spade I would find it hard to bet. This way you allow him to bluff into you on the river and you also don't get c/r by a player who may have bet out a flush draw.

You can then make your nut flush draw and raise him on the river.

Raise flop / fold to a 3-bet. Check turn when called on a spade turn otherwise bet and fold to c/r. Call river bet on no flush, bet/raise river with flush.

True