Hi
I have about 150 flights on my Fazer and I have learned a lot
about aerobatic/3d flying from it.
For a flat spin I start fairly high up, cut the throttle, use full upelevator, full left rudder, full left ailerons (on low rates).
As the plane starts to spin I will feed in a bit of throttle ( 1/4 - 1/2)
and then slowly move the ailerons from left to full right.
When I do this right, the plane spins around propellor and falls like leaf!! Have even cranked in full throttle!! ( i have re-enforced the fuse considerably).
Too much aileron will make it snap out of the spin so use enough aileron to flatten the spin.

Enjoy
Bill