Nice write-up SNO. I have been using the OG Crystal for a year now. If you have any questions let me know.
I tried the Pimax top strap, but found it needed a pad to avoid hot spot. It also pushes out the padding alongside the ear pieces. I thought the adjust-ability of the top strap was going to be really good, but did not find it much better than the Apache strap. For me the Studio Forms Apache strap works the best.
I have a couple sets of the HonsVR prescription lenses and have been very happy with them. If they messed up your lenses, don't hesitate to contact them. I have found HonsVR to have very good customer service.
I also found the face pad for the Samsung Odyssey Plus fits the Crystal very well, especially if you wear glasses and have a thin face. Much more comfortable, no light leaks, and easy to clean.
https://www.amazon.com/VR-Cover-Replacement-Samsung-Odyssey/dp/B07YSKPK2Q/As far as face pads go. Most G2 face pads will work with the Crystal as well.
Something else to look into is FFR (Fixed Foveated Rendering). This works with the G2 and Crystal Light. In essence it tells the GPU to give you the sharpest image only where your eye can see and everything else is rendered at a lower resolution. The end result is a performance boost of 20 to 30% without any noticeable loss of clarity. First time I used it I did not think it was working, as I noticed no visual difference. Then I looked at my FPS and noticed a marked increase. I was then able to crank up my resolution to make things even clearer without bringing my GPU to its knees. The wiki mentions it working with SteamVR, but I have not tried it. Here is more info on it (read down a little bit and it discusses the G2 and Crystal light):
https://github.com/mbucchia/Quad-Views-Foveated/wikiHope this helps.