[charlieD]

i'm not sure i like the flop semi bluff with the ace on the board
his thinking time after the turn c/r is a worry. because if he had an ace he would atleast call if he had a smaller flush draw he would have an easy call but if he had say 66 he may take some time to consider then decide either way and once he has called the turn and a non spade river brick falls he will auto call the river
otherwise i think you have given yourself every chance to win the pot and i hope i'm wrong