if my research was right, the C-130 tests actually proved fairly viable, in terms of takeoffs and landings. the reason it was never picked up was that the sheer size of the plane and the deck area that would have to be cleared to let it land and take off was just so large that it was a major disruption to operations, and would limit the number of planes that could be carried in the air wing (since they wouldn't be able to park as many on deck, in order to be able to clear them out of the way.)
so instead they developed a smaller Carrier delivery craft, the C-1 Trader, that could operate off carriers using the same catapult and arrester wire set ups as the fighters, and which would be more easily slotted into normal deck operations.