4.25 to 4.50 would be fine for ME..... for you it may be to much. set your CG at 4 inches or less, it will be a bit nose heavy at 4 inches. you'll need to add lead...go ahead and do it,once you see how it fly's remove lead too move it back no more than .25 inches at a time. mine ended up CG balanced at 4.75, inverted flight requires little to NO forward pressure at 4.75. BTW invest in or build a CG machine, it makes setting the CG so much easier.

John