Hi Stephen,

this issue is timing related. Try to reduce timing and the problem may go away. 22° would be something to start with
Your drive set-up is close to the maximum power. Your newer batteries have less internal resistance (better hold voltage) and cross the maximum power your set-up can deliver.

I had the same issue with a Hacker Motor once. Reducing timing from 30° to 22° did the trick. You can also try to reduce acceleration a bit. If nothing else works a smaller prop may be required. This is however the last option I'd try.

Best
M