My MES 40 is "Starved For Air" and I do a couple things to improve airflow.
I think what's happening, is your AMNS is not getting adequate air or you don't have a good "Cherry" burning in the sawdust. I even blow on the embers to make sure it has a good cherry burning.
Propane and Charcoal Smokers have huge intake vents, but for some reason, Manufacturers of Electric Smokers do not have large intake vents.
Light your AMNS with a torch or lighter for about 30 seconds
Leave it on top your MES for about 10 minutes, to make sure it''s burning good.
Open the top vent all the way
Remove the chip loader
Pull out your chip pan out about 1 1/2"
Place your AMNS on the bars or on the bottom rack.
Here's a couple pics of my 40" MES with the heat at 275° when I did an airflow test
Chip Loader & Chip Pan in all the way.
Notice the paper is not moving
Chip Loader pulled out 1/2 way and Chip Pan Pulled Out 1 1/2"
Notice paper is at about a 45° Angle = Huge Diff in Air Flow!
This pic is of a 2 1/4" hole I drilled in the end of the housing for the chip pan
I figured this was a little safer than leaving the chip pan pulled out
Try this test for yourself and you'll be surprised at the difference it makes the airflow inside your MES
You can always PM me or even call me @ (952)412-0484 if you're having issues