Hi there , i have had major issues over the years and had the boat serviced by several mechanics only to find that the best one down here in the sutherland shire cronulla in nsw australia can opnly get the boat to 14.5knots at 4200rpm. It astounds me to find that friends of mine have 20 year old 28 foot searays that does 24 knots comfortably. Well the boat has been antifouled legs serviced and engines tuned. The computer apparently reports the engines as running at optimal performance. So what is the issue no mechanic has yet been able to resolve this for me . Some tell me it may be the gear ratio in the legs others tell me that it could be the props. Where do i start, i am not mechanically minded so hence in the hands of the gods! the mechanics. I am told that this is the best I can get but I am not convinced. Where do i start? please help or put me in touch with someone that can help. We now only hang out local in the Port hacking river as i dont have the confidence in the boat to go outside. It travels comfortably at 8 knots but as soon as you give it some throttle it cavitates heaps of water in the stern near swim platform and all it does is chews up fuel. Drop down to 2000 rpm and runs beautifuly but only at 8 knots. Why please help!