JP is a great designer and the Wizard is a great jet but even great designs can be improved. I already had discussions with JP concerning the CG of the little Wizard but also on the ventral fins that are a big improvement on stability as well. Anyway, the Wizard will fly great with the tank set-up of JP. Can it be improved? In my point of view, yes.

In my Wizard you can clearly see my tank is on the CG and my engine is on the back part of the engine rails. I have flown many EDF jets (airworld cougar, eflite habu, mini avanti) converted to turbine in the past and all had the same issue with commercially available turbine mod kits. Fuel tank in the battery pocket, resulting in noticeable CG shift during flight.