For those of you with the newer Eko controller (or any other gasifier with a purge cycle for idling): What experience have you had with different purge timing? Reason I ask is that I'm experimenting with controlling combustion temperature by modulating the blower speed. Problem is that with a fresh load on hot coals, the combustion temp gets well above my setpoint, and the fan ends up running at minimum speed for a long time. This causes 'puffing', and I expect that periodically running the fan on high for a few seconds might be the solution. How often should you run a purge cycle, and how long should the fan run each time?