Got a slidemaster manual jackplate on my 06 Puma wide. Im trying to get to the high 70s or more with my 275 Verado. Im currently raising the jackplate 1/8 to 1/4″ at a time. The jackplate only gives 3″ set back. I cant even find a 3″ Slidemaster on the internet. Seems they are 6, 8, or 10. Anyone know about this, and how much would it help my top end by getting the 6, 8, or 10″? The 28P 4 blade Bravo 1 and 2.5″ prop to pad only gets me in the low 70s now, and at just 5600 rpm and 20 water pressure.. Thanks for any good ideas.