For what it is worth I try to do my SPINS with RUDDER only.

Below is paragraphed copied from the IMAC site.


Some models may require a little aileron, but be very judicious with aileron application early in the spin entry, because if the plane rotates past 90 degrees the maneuver is a "wing over and not a spin as the plane is not autorotating around it's center of gravity. I have found that, in most cases, my models will spin with only elevator and rudder and in a few cases I may have only have to "lean" on the aileron.