That is quite a strain for any controller, actually. The MM has to have a 240K limit for 2 polers otherwise you couldn't use this setup.
7.4*9200=68080, and being a 6 pole motor- 68080*3=204240. It's like running 204K rpm with a 2 pole motor!
That will stress ANY controller.
Yeah I've heard the same about the 15-30* timing. What setting are you on now? Have you tried it at a lower setting?