The pitch of the prop does look too big.
However if you want to experiment with the height of the outboard, well that should be just a case of lifting it to a different set of holes in the bracket assuming that you still have some adjustment left. Otherwise you're looking at drilling a new set of holes in the transom.
If you decide to lift the outboard go for a 1" lift at a time and see what difference it has on the WOT and handling.
Looks Slow but is Fast
Member of the ebay Blue RIB cover club.