Did you read this thread?Pictures of a burned pipe and worm due to improper feed/air
The auger pipe should not be getting so hot that you cannot rest your hand on it. It doesn't matter how long the stoker is running for, when adjusted correctly the pipe should never get that hot. If it does then the fire is burning back into the base of the pot and into the feed pipe.
Set the feed at 4 teeth and adjust the air accordingly so you have the correct burn in the pot. From the EFM manual:
With a properly adjusted fire, there will be an ash ring approx- imately 2” wide around the outside of the burner ring with a small dark circle in the cen- ter of the pot. This is the fresh coal entering into the bottom center of the pot. With too much air, the fire bed will tend to develop cracks, the ashes will clinker and the dark spot at the center of the fire will disappear. With too little air, the ash ring will be very small, hot and dark, falling off the burner ring into the ash pit and the dark spot at the center of the fire will be large.
Also I haven't seen any mention of the draft readings.
From the EFM manual:
2. A good draft is essential for proper operation of the stoker. This draft is created by the chim- ney when it reaches operating temperature. The draft should be checked with a draft gauge at the stack. The gauge is inserted into a 1⁄4” hole, drilled into the stack at a point within 12” of the boiler base outlet and before the barometric draft control. The draft at the stack should be negative .04 to negative .05 inches of water column. The over-the-fire draft is checked at the 1⁄4” diameter hole drilled into the fire door and should be neg- ative .02 inches of water column. Adjust the barometric draft control to attain these settings.
Be sure your draft is running at the correct settings. I have a manometer (draft gauge) permanently installed on my EFM, I check the draft reading every day.