We took a trip to the audiologist to re-check that right ear now that the fluid is gone. Good news- he's back to his August levels in that ear! I don't have the report yet, but I think he was 60dB at 500Hz and 1000Hz, 40dB at 2000Hz, and 50dB at 4000Hz. They tested his left ear again, too, and it was about 5-10dB better than the right ear. He does appear to have some fluctuation at the high frequencies, but at least he's staying in the moderate range.
I am very grateful that we listened to the audiologist and ENT, because with a blocked tube he had thresholds of 80dB in that ear! There is a HUGE difference between a 50dB threshold and an 80dB threshold (remember that decibels are logarithmic).
We are free from doctor appointments until January, when a trip to pick up earmolds is scheduled. Ahhh... blessed freedom!