You fellows running the Fuji Controllers may find this helpful, it outlines the steps for programming, although it is for a Kiln Oven application, the steps for programming should still apply.
Let us all know if this is of any help.
@ Freddy, What was the outlined steps for unlocking the Fuji, could you write it up in similar format as like I added? What year model S130 is you friends? Wondering what years the Fuji was standard. And when the Dwyer/Love Controller replaced it?
I should think your friend will see great improvements. Lowering the ashing temps will move the fire (hot coals) higher, which is better
for when fresh coal is dump in on top. When it is a lower fire, it has so much more fresh coal that produce so much more gases that need to be burned or else!
A proper draft goes a long ways towards keeping gases burned off too.
My belief is, if one has "puffbacks" they must get the fire(hot coals) raised higher in their firepot.
What the digital display reads on the controller may not match the owners manual or even what other AHS owners settings are...keep adjusting lower to get the fire higher and the problem will be gone.
Here is a picture of where I have my Paper Binder Clip:
Notice blue gases are ignited before being drafted away. This photo was taken immediately after blower had shut off.