Flat spin = do things to make the pitching moment less (or is it more?).
So, spin in the 'natural' direction of the engine (i.e. with the torque moment), apply into spin airleron (get that drag up), more torque from the engine to really get her going. If you're loaded with an aft CG all the better (weight at either end of the centre of rotation makes for more flatness).
Then do everything EXACTLY as per the manual to get her back before c'est Fin. EXACTLY as per the manual.
Please, those that know better - make with the corrections...
p.s. EXACTLY.