Still running the P99, no major hardware changes. Yesterday I turned off time alignment
because I had been hearing slight phase / comb filtering noise when using FM. I don't use FM that often but when I do I expect it to sound better than most new OEM systems and honestly it didn't.
So I turned off all TA and adjusted the levels to be equal left and right and then centered the image using the balance control. So far it is a smoother, easier to liste to sound with and extreme wide soundstage compared to the TA optimized "spot light" in the center of the windshield where most of the sound originated from.
The new sound isn't perfect but I am enjoying it.
I has also been noticing less bass impact- I may need to remove the door covers and see if my woofer screws are loose. My sub screws were definitely loose and tightening them also tightened the bass.