Fuselage side area . . . or speed - the more the better. Current designs have lots of fuselage and fly a lot slower than pattern ships of 25 years ago. Look at the Dirty Birdy or the Arrow for example: minimal fuselage profile, yet both rolled very well and flew fast. I built a modified Dirty Birdy with swept wings (not a lot of sweep) and it rolled great powered by an OS .61VF.
My 2 cents
Will B.