According to Merc Racing the Mirage Plus is a maximum bow lifter.
http://www.mercuryracing.com/propellers/mirageplus.php
They describe the Bravos and Trophys as 70 mph+ w/ Med bow lift and the 3 and 4 blade cleavers as 80mph+ w/little bow lift
Problem might be that their pitches are > 25" and your boat may be heavier than props were designed for. I'd hit the prop guy up for a 3 blade cleaver or a 4 blade trophy or bravo if they make such a thing for stern drives and see doesn't ride a little flatter at the crazy speeds your you're attaining. Again this theory is based on Merc Marketing not my experience. But as long as you got a guy loaning you props - heck, check 'em
