Great read, thanks. More than anything, that report explains the importance of following the spin recovery technique, or it isn't going to stop. It echo's what I was taught, but never with the context behind it.
The throttle part is interesting - it suggests an easy entry in to another spin in the opposite direction unless you are quick off the rudder. Also recovery from an inverted spin can be achieved by merely centralising the stick, not requiring opposite rudder and stick back.
I miss flying - I hope it's not thirteen years !!!!