So 3600 16,18,18,18,36 crashed
But 3600 16,19,19,19,36 was ok with a quick timespy run.
Voltage was at 1.4, so I'll increase it to 1.45 and try again with the lower timings.
I'll also try lower SOC voltage.
Edit -
3600 16 18 18 18 36 was ok at 1.45v
Running a stress test to double check...