I’m afraid a 200N turbine is way over powered for this airframe. You see this F-18F is the same as the BVM/TAMJET one ( same molds ) with lots of updates in structure, landing gear etc ,all at a significantly lower weight. We test flew ours for a few hours with different power settings , started at 140N and went up to 180N.. we felt that that was the top power rating this airframe can be safely be operated at without possibly over stressing the structure through various manouvers , we took an as close as possible look at how much are the wings flexing at high G manouvers and yet keeping the ability of the model to do a quick landing abort ( fast energy response) stil if needed.
From our experience 160N ( is roughly what you get at 32 degree centigrade at 1000 feet above sea level from a P-180RXI) is where one would want to be with this airframe.