Looking at Novak's kv to turn chart - it looks like a 7.5t at 5900kv is the most powerful you can fit. - a fair bit mroe than the 3300kv motor in there at the moment!
Other than that I'm afraid I can't help much as i don't know a lot about non-sensored motors.
Can't see anytihgn obvious on moelsport's site either. Good luck.
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