Interesting results with doing the second door and putting the door panels back on:
155.0 dB -- Base-Line Score this morning
154.9 dB -- Base-Line with driver door panel and vapor guard off
155.3 dB -- 1st Layer on Driver Door
155.2 dB -- Put 5.25 speaker back in (not hooked up)
154.8 dB -- Removed Passenger door panel and vapor guard
155.1 dB -- 1st Layer on Passenger Door (with speaker installed and not hooked up)
155.3 dB -- Put passenger door panel back on
155.1 dB -- Put drivers door panel back on
So... weird stuff is going on.
Frequency may have changed with both of the door panels on.
It had not changed with both door panels still off + both doors dampened but I have not went back through the frequency range since putting the panels back on.