Wow! You’re as much of a tweakaholic as I am. You go about tweaking as I do ... one at a time in order to gauge the effectiveness of the tweak.
I haven’t tried any of the products you’ve listed in your above post. The closest one is the Shakti stones. I don’t have the stones, but I do have four Shakti Holograms, one in each corner of the room. Very effective, setting aside their flimsy construction.
On what to remove when installing The Gate ... I know that some members have removed devices using magnets and have gotten better results with the PPT products. Other than that, I don’t have a clue. Maybe some other members will chime in here with their experiences. My suggestion would be to call Tim Mrock, the PPT designer, and ask for his advise. You’ll find him to be very helpful with no BS.
By the way, there’s more than one way to skin a cat, and more than one way to reach audio nirvana. Your description of how much you enjoy your system parallels mine for sure. I’m still in disbelief that a home audio system can do what this system is doing. Honestly, there is no longer a system involved ... only the performers spread out around the room.
Last night my friend Robert came over for a listening session. I put on a reissue of the Chico Hamilton Quintet from a Mosaic box set that I haven’t listened to in ages. My God ... that group was so present, I felt that I could reach out and touch Fred Katz’s cello. Oh, and these are early recordings before plastic was used for drum heads. We could clearly discern that Chico Hamilton, the drummer, was using drums with animal skins and not the modern acrylic.
Here’s the Chico Hamilton album. The original has been one of my go-to demo albums for at least 30 years. This one is mono ... you'll want to find the stereo version. No stereo versions offered on eBay at the moment. https://www.ebay.com/itm/Chico-Hamilton-Quintet-self-titled-Keith-Finch-Cover-Pacific-Jazz-PJ-1225-MINT/173870077849?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160811114145%26meid%3Dec04a1bb494c47c0b62f16f357700859%26pid%3D100667%26rk%3D7%26rkt%3D8%26sd%3D392332352111%26itm%3D173870077849%26pg%3D2045573&_trksid=p2045573.c100667.m2042
Give Tim a call ...