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Don't you get bored of knocking it outta the park so often??
I would have to see this scenario replicated/reproduced to believe it. I'll go out on limb and say that there's no way an egg filled to the top of the fire ring can burn out in 4 hours, without truly registering any higher than 280 on the thermo. To burn that much lump to ash, the temp would have to hit higher than 280, no matter which lump you used.
-your thermo is not calibrated correctly.
- the thermo had actually lapped itself i.e. the needle wrapped around so the egg wasn't actually going at 280, it was blazing past 700 and climbing.
-you have a leak somewhere e.g cracked base, leaky lower vent, etc. My small would be full of ash and still warm the morning after a cook. I resealed the lower vent and all was good again.
- the top vent is leaky when you close the DFMT or put the ceramic cap on.
I've burned about a pallet of RW and never seen anything like this.