Personally, I'd either do one of two things, send the CLE to Titus and have him cut the entire cone off and redo it, or sell it and find you a Sportmaster.

Being a 225 Promax, it more than likely has 1.87 gears, it could have 1.76 gears, if it in fact does, your prop is way too big and the gear ratio is killing you. You have too much prop if you can't get the motor up any higher, and with 10 lbs pf water, I wouldn't come up any more.