For what its worth, heres my exp. I built and still fly a SIG 1/4 Clipped Wing Cub. Its fitted with G26 with rudder servo tail mounted.
5" Du Bro pneumatic wheels. 6.5 kg digital on elev. Weighs 16.1 lbs and required no ballast. Slightly heavy, but the scale speed AND sound are for me (and others) purrrfect. It will struggle to loop without a slight speed build. Touch n goes are somthin else!! It can really bounce!
If I built another, I'd go for a G38........
Terry