That's opposite what OP is asking for. Higher rear would add acceleration and lower top end.
OP, you must do a lot of wide open riding. Have you tried 15/41 on that combo? One tooth up front is about the same difference as 3 out back. It would be likely about all the gear you could pull with your set up IMO. Maybe try 15/39, but that and those 22" tires are gonna make it feel flat up top.