These are great boats, and you can't compare to RIBs. Because it's light, you're likely to see the bow rise. The secret is hole shot to get on the plane quickly, lean forward with the tiller and the nose will come down, then you can ease off on the accelleration and cruise. To be honest it's far better with two up, but if that's not possible, get a bag of sand, yes that's right, a bag of sand and rope it in place at the bow.
I used to run a MKIICGT with a Yamaha 25. Make sure the trim angle is set back hard against the transom. Also is it a standard shaft engine? Older models were, however new Zodiac Futuras use oversized tubes and moved to long shaft engines. Basically the anti ventilation plate above the propeller should be level with the base of the hull at the transom if you're checking.
You responded to an old thread about leaks. These boats are serviceable. If it's leaking from the inflatable hull, then remove the aluminium floor. The fold nearest the transom on the hull tube is a regular place for them to fail. These boats were originally thermobonded at manufacture. You can get Polymarine 2-part glue to repair. Follow the instructions to the letter for a satisfactory repair.
Also check the valves. The rubber one way valve diaphragm, gaskets and cap seal age and lose their suppleness, and again can be replaced. Parts are readily available from a Zodiac main dealer.
Is that with or without VAT?