RE: I ground looped another cub
Korps,
Forward location of main landing gear (I know it's a Tail dragger- move wheels back slightly improve ground looping, but make nose over worse), high aspect ratio wing with a near flat bottom wing, small verticle tail in relation to the wing.
To tame the taildragger, Toe-in on main gear, keep rudder deflection to a minimum, take off DIRECTLY into the wind, cross wind TO's can get exciting in a hurry, don't try to horse it off before flying speed is reached.
MTY
also make sure your both main gear wheels turn freely, even if they have a side load. And get a bigger Cub larger fly and ground handle better. (IMHO)