I have a 2005 8HP Yamaha 4stroke outboard model T8ELHD on my AB dinghy model 3.20 VS, LOA 10"6", LWL 9", normal displacement 750lb, maximum displacement 1400lb. The standard Yamaha propeller for my outboard is an 11-3/4" x 5-3/4" - R, 7 tooth spline, model 96GF-45941-00-EL. It"s my belief, seemingly confirmed by propeller calculations, that this outboard/propeller combination is a high thrust unit designed for much heavier displacement boats than my dinghy. According to my calculations I should have a propeller of size about 11-3/4" x 11.5"-R. However when I search online I can not find a propeller anywhere near this size. Also Yamaha advertise Propellers for an F8 outboard with a gear ratio around 2:1 whereas I cannot find any advertising for my T8 outboard which has a gear ratio around 3:1. Can anyone help advise me please as to what I should best do? Thanks.