I have a 16 ft mirrocraft aggrressor with an 80 and 9.9 evinrude kicker. It now has stock 10x9 1/2 prop turning at 3990-4040 at wot. My question is I would like to get a spare prop and would like to get the rpms in operating range. I can now get 9mph with me and son in it. which do you all recomend. Thx