I have to go somewhere right now.
About the "AMA low toggle", when blur reduction is enabled, it's more than just turning the monitor off making it revert.
EVEN changing the BRIGHTNESS By ONE POINT reverts the AMA level instantly.
And changing ANY strobe setting by even 1 point (Duty, Phase, Single Strobe on/off EVEN if ur at 100+hz refresh rate) reverts the AMA.
Changing contrast, gamma, sharpness, etc is safe. In fact, on the XL2720Z, you need to change contrast as the overdrive setting tends to be too low after doing the toggle, and lowering the contrast reduces the effect of a too low overdrive. On the XL2411Z and XL2420Z, you don't need to change the contrast, as the AMA is only lowered by a small amount. On the XL2720Z, it's lowered drastically (remember this is a 27" panel vs the 24" panels on the other models).
If you did this trick with the profile bug to get AMA low with blur reduction DISABLED, then changing strobe settings doesn't change the AMA (since MBR is off) and changing brightness won't revert the AMA either. But changing refresh rates, changing display mode picture settings, etc, anything that fully refreshes the monitor, will revert the AMA.
I use this page to test if the AMA Reverts or not: You can easily tell by looking at how the OVERDRIVE GHOSTING APPEARS:
http://www.testufo.com/#test=photo&phot ... &height=-1
Your timing values and pixel clock are perfect. You will have zero problems with those timings at both 100hz and 120hz.
I found that 125hz works best at slightly different timings. (125hz divides evenly into 500hz for 500hz polling gaming mice, while 120hz does not...sometimes if using VT 1500 at 125hz, when you switch picture modes, sometimes (not always), the monitor will stutter and backlight will pulsate. This is due to the scalar not liking that VT. Usually there is always ONE VT in the range of VT 1497-VT 1502 which will work the best. 125hz works best with VT 1497 (pixel clock 389.22 MHz)
Example: 85hz refresh rate is only stable with VT 1501. While 1497, 1498, 1499, 1500, 1502 all cause pulsating backlight and frame stutters on the monitor scalar end.
Random fact before I leave:
You can run your monitor at 2560x1440@100hz.
Enter these timings in CRU:
2560x1440
48,3
32,5
HT: 2720
VT: 1502
refresh rate: 100hz
Pixel clock: 408.55 hz.
Note: Crosstalk will be IDENTICAL to 1920x1080@100hz WITHOUT a VT tweak. That's because we are using the VT tweak itself to trick the scalar into accepting 2560x1440. Even though crosstalk will be high, Strobe phase >059 will still shut off the backlight.