I wouldn't try to rep a set when all draws hit on the river and villain called a small raise on the turn, possibly indicating a draw.

I also like to have a bit more equity when I make a big bluff. The few times you hit your miracle will make the bluff a lot more profitable. This is a somewhat similar weird line bluff that was called down light (snapcalled) because my line didn't make any sense. I was planning to give up river.

Seat 3: BB ($614.05 in chips)
Seat 7: HERO [ AC,4C ] ($1150.00 in chips)
Seat 9: BUTTON ($1,457.00 in chips)
Seat 10: SB ($1,005.00 in chips)
ANTES/BLINDS
SB posts blind ($5), BB posts blind ($10).

PRE-FLOP
HERO bets $35, BUTTON calls $35, SB folds, BB folds.

FLOP [board cards QS,2H,3D ] (POT $85)
HERO checks, BUTTON bets $45, HERO bets $150, BUTTON calls $105.

TURN [board cards QS,2H,3D,KH ] (POT $385)
HERO bets $255, BUTTON calls $255.

RIVER [board cards QS,2H,3D,KH,5H ] (POT $895)
HERO bets $710 and is all-in, BUTTON calls $710.

SHOWDOWN
HERO shows [ AC,4C ]
BUTTON shows [ AD,AS ]
HERO wins $2,313.