Here is some input. On my 40% Extra (F/C- Composite ARF type) I found that the airplane would go into a "lul" before it would spin. Essentially it would be partly stalled but would not "break" into a spin. If I started it with rudder at this point it would look like a forced entry. So what did I learn? I would enter the spin just as if I'm landing (more and more elevator progressively added in) as it approached the stall point, I'd add in just a click or two of engine. That would clean up the stab, and give the authority to the rudder for a clean spin entry, without it "wallowing" or "unexpectedly" dropping a wing.

Finally, I've been there, done that with regard to over-shooting a spin entry. How do you get rid of the energy fast without nosing the plane up (and climbing)? Put in some rudder and ever-so slight opposite aileron. Even just a little bit of slip will bleed off speed and slow you down so you can enter the spin in the spot you want without overshooting.

Anyhow, this might be a bit advanced, but these are some techniques I have learned.

Don