I read a bit about the L4 Cub when I owned one and vaguely recall that the USAAC originally used to fly solo from the front seat. I remember doing the W&B on mine for front seat solo and it was juuuuuuust inside the forward C of G limits (by about 0.001"). I would imagine that the weight of the radio etc aft of the C of G would have made the original military equipped ones less sensitive but I'm sure the USAAC discovered that they were still very tail-light on the ground. Going over a dandelion would make them stand on their snouts accompanied by the sound of swearing and splintering wood. Hence the sensible idea of soloing from the rear seat only was born.