I have been running my 300 for about 2 weeks and always had short burn times and stack temperatures up to 580F. I load the boiler up to the bottom of the loading door on an initial load and on a reload . So we are talking about 25 mixed hardwood splits both times . I recently installed a PID controller to monitor temps. After an hr of lighting , the temps climb up to 450 , then suddenly climb to 550 plus. The spin air controls under the fan cover are set at 2 1/2 turns open, the draft wheel on the fan is set at 2 1/2” at the widest point on the 2 pie shaped openings. Burn time about 2 1/2 hrs. On a reload, same amount of wood , the temperature will climb to 580 at about the 1 hr mark and slowly decrease over the next 2 hrs. I can raise the 1500 gallons of storage from 120 to 180 in this 5 1/2 hr time frame . Am I missing something? Flue pipe is 16’ of double wall stainless 8” . The boiler is essentially new with Econoburn, doing a total rehab which included a total replacement of the back of the boiler and heat exchanger. Airlina has been coaching me along on the startup , great thanks to him, but I’m at a loss as to what can correct this problem.