I have a 2008 160hp jmax extreme shallow and am having problems with cavitation. I have a solas 14/20 impeller that is fit nicley to the sleeve which is in good shape. It seems to cavitate more in bigger chop but today I took it to finger lake to do some load/weight testing and the boat seemed tonbe sucking air lighty loaded and then could barley put 1500 pounds on step and seemed to be slipping and not pumping water to full potential, which really seemed to hurt the ability to step more weight. I know the jet units on these boats really are a downfall but i have seen a 20 foot sea ark with a 150hp jet drive step 2800 pounds, can someone explain that to me? I am taking the sleeve and impeller I AFF to see if they can tell me something I don't. Any suggestions or knowledge about this cavitation and weight hauling problem would be awesome to hear thanks for any input.