RE: need suggestions for next plane.
Well you sound as if you have the NEED FOR SPEED bug.
Try a fast foamy that can use the gear from the cub. Such as a small flying wing or delta wing.
Likely the gear will survive this plane and scratch built foamies don't cost a lot of scratch.
Free plans abound with just a bit of a search here on RCU.
The plane won't cost much and the learning will be pricless.