Spinning Chipmunk has been a topic of conversation many times over the years.
I am no expert.
There is an excellent article on Chipmunk spin recovery, from Australian Safety Digest No 22, (our crash comic that then was superb).
It is available in this fairly recent report (as an appendix, starting on page 22 - 27 of this report - "The Chipmink Spin - The Facts"
https://www.atsb.gov.au/media/576808...nal_report.pdf
My take on it is all Dan Winterland said, espec about being sure stick if really fully forward.
Additionaly know it can take quite some time to recover from spin even with proper technique and control position, and do not be tempted to think proper recovery technique is not working for some reason, but just keep the controls in recommended position and WAIT (do not think you have to try something else as "it is not recovering").
Again, the appendixed Spin article above is seminal and well worth reading a couple of times if you fly the Chipmunk.
Edit, more here:
http://www.pprune.org/pacific-genera...-accident.html