Here is a look at our spectrum with 4 changes made:

We were back at the TCS settings from late July.  (This was before I changed the ring heater back to 1.5 W total to go back to early July). 

27 Watts

DBB unplugged

PMC realigned

The noise lump is still here, although not as bad as it was yesterday.  Most of the peaks are smaller but some new peaks have appeared.