I have a 99 Cobra 190D with a 150 Merc. Efi. Running a 3 blade Tempest Plus. I just added a 8" Hydro Dynamics jack plate. I am running 4 1/2 inches below pad. The change in performance is : It is now faster out the hole than believable, runs 56.0 GPS WOT but I am throwing way too high a rooster tail, about 12 ft. high, at WOT I can only get 8 lbs of water pressure, the gauge is new so I know its correct, to get 12lbs of pressure I have to trim down, but loose speed. So~~~what to do? I have a new pair of trim extenders not installed, should I lower the jackplate and add the extenders?