From what I have read on the subject, there are some planes [there were]that if you spin to many times it does not want to come out of the spin. You may have a design or set up that has the tendency to do that. I am sure that CG will effect it to. If my memory serves me right,when I took flying lessons many years ago,they warned about doing more that 2 turns in a spin[Cessna 150]. I think that one reason is you can lose a lot of altitude in short order ,but I think the other reason is what I said above.