Thanks for the incredible information you two. I had a hope that the screen protector itself, the one I installed after removing the Zagg, was causing the problem. When I installed it, I placed it edge down, then aligned two sides, and layed it down by gradually, gently pushing down from the edge across to the opposite edge. I suspected, hoped, that the pressure of pushing it down had created a tightness on the one side, and a soft, looseness on the other which I had inadvertently spread the soft, pliable built-in screen protector to. I removed the screen protector, (which was an expensive to acquire genuine Hori), and it seems that the problem has been removed with it. After a little while to relax it's fibers, the screen seems to be uniform across the majority of it's surface, with only a little bit of tightness, seemingly uniformly spread around all four edges. It's a huge relief because I'm a pussy that needs his little golden gameboy to be perfect. XD Colours! does seem to draw much better without a screen protector.
Now, I have one set of screen protectors left. A rare set. A set that, last time I checked, is nearly impossibru to get at a reasonable price, if at all.
Capdase. The one that's better than Hori. (Trust me, I researched this. The consensus is Capdase is the best. I was planning on saving the best for last, for 20 years from now).
Capdase made three types, I don't have the three types on hand, but there were three. Different glare surfaces and the like.
This one is anti-glare on the top, anti-smudge on the bottom. It's actually made for the Phat, but the Lite has the same size screens.
Now, I'm not so sure I want to give up the sensitivity/confident I can install it without having the same problem repeat itself.
If you're careful, will the screen still eventually scratch when playing Trauma Center, etc? Or will it not scratch, as long as you're careful and don't let any one area (heat up from friction)?
Anyway....
The Capdase is .. for sale. Sortof. Make me an offer.
and thanks again for the information. I love GBATemp!
P.S: Yes the Zagg Invisibleshield is really, really nice to protect the case, but I think the Bestshieldever is probably just as good, just with a few less pieces. Invisibleshields on Amazon.com really dropped in price from a year and a half ago too. For under $10 I'd say pick one up if you want to keep the DS scuff and scratch free, give it a nice rubbery gloss and grip, and prevent fingerprint being visible. However, their screen protectors are garbage, and peeling it off was stressful, it's really stuck on there! Unlike real screen protectors which are kindof stiff. The Zagg is the same gummy material as the rest of it, the stylus doesn't slide easily on it, it has a soft gummy feel, and it's slightly yellow (and I hear it gets more yellow with time). Installing it requires the use of liquid, on your screen (!), and I'd say is more likely to result in captures dust particles. The worst part is the uninstallation. Oh, and they explicitely assured me that it could be removed without damaging the DS, even after 20 years (yes, I specifically asked them about a 20 year timeframe). "Stretching" the truth at best, lying or incompetent at worst.