Please go to PICTURE ADVANCED and set "Display mode" to full screen. Do that now.
It might have a different name on the XL2430T.
And DO NOT disable Instant mode for any reason. Unless, of course, you want to see pictures that look like broken glass rather than a monitor (I don't think any damage results from this but still).
The "Aspect" setting becomes improperly available when using a VT tweak because the scalar thinks it's running at 1440p, and 1080p < 1440p, thus aspect becomes available. Scaling puts extra stress on the monitor. Only "full" should be available. It's very easy, especially if using lower resolutions than 1920x1080, to have "aspect" suddenly become the default setting.
Here is why the Aspect setting becomes available when a VT tweak is in use.
This is what the scalar says during a 1920x1080 @ 100hz VT 1500 tweak (XL2720Z).
VT 1497-1502 is used internally by Lightboost mode, and 1280 is required to fit in specification.
1920x1440 would display "Out of range!" with a screen anyway, since 1920x1440 is clearly larger than 1920x1080.
(you can get 1920x1440 on the scalar by using a VT of 1481-1485).
It seems like changing the VT increases the Vertical resolution by a designated logical amount, starting from 1125 and going up slowly. However the horizontal value seems to defy logic.
1920x1080 with a VT of 1125 (default is 1138) displays "1600x1050". This makes no sense.
1920x1080 with a VT of 1180 says "Out of range!) and displays 1280x(something close to 1120).
1920x1080 with a VT of 1354 says "1600x1280" (from faint memory, I could be wrong)
1920x1080 with a VT of 1400 says "Out of Range!" showing 1792x1344.
1920x1080 with a VT of 1481-1485 says "Out of range!" showing 1920x1440.
VT 1497-1502 and the horizontal drops hard from 1920 to 1280. There has to be huge significance to this range, probably dealing with a reserved area for Lightboost mode's accelerated scanout.
Nothing higher works.
However you can get a whacky resolution by trying this custom resolution, and the scaler reports something bizarre like 2160x1700:
3200x1800
48/3
32/5
HT: 3360
VT: 2220
Refresh rate:60hz
Blur reduction with single strobe=disabled will shut off the backlight instantly.
Blur reduction with single strobe=enabled will double strobe.
This setting is unreliable.
this usually works but if a game switches to it from a lower resolution, the monitor might just turn white and start flickering and not responding correctly until the computer is rebooted.
3840x2160@30hz works too. Monitor OSD says "480i" for resolution -.-