Got some good news and some bad news.
1st the good news:
In my quest to still hit 150dB @ 20Hz I tuned the box even lower.
I gained 0.1dB on my average score:
Also did 150.8dB @ 20Hz
Dropped a bit on Peak SPL, doing a bit less than 155.0dB but that`s no problem. Can soon sort that out tuning slightly higher until it still does 150dB @ 20Hz & 155dB @ peak.
Total Average ((((Propper Droppers)))) Score =
153.3dB
Peak= 154.8dB@ 32Hz
40Hz= 153.7dB
33Hz= 154.7dB
25Hz= 152.9dB
20Hz= 150.8dB