By gentle, I really meant g and velocity (forward and downward). Its an unsettling manouevre for the pilot, but not violent.
This is a bit esoteric, but a 1g entry to a spin should have a wing drop only, not a corresponding wing rise. The awful "flipping on its back" sensation comes from an accelerated spin entry. Its really a quasi snap roll entry. It scores badly in competition.
A developed spin is inherently stable with typically relatively low descent rates.