Custom Resolution Utility (CRU)

[kulu]

Hello, I have this strange problem, I am unable to get my 4:3 CRT (NEC FE791SB, 17") to display sharp image. I was suspecting CRT/cable/RAMDAC/video card/etc. but then I found out that if I use certain refresh rate/timing combos it actually gets much sharper... in awkward way. The image looks like it's aliased, I can see some jaggies, I can also see some sort of lines that look bit like interlace lines, but they are much thinner and harder to see than interlace lines. Moreover this effect is very hard to achieve, I was successful only with lowest resolutions: 640x480@100Hz and 800x600@100Hz, couldn't get 1024x768 to do it. The way I managed to get it was by removing all resolutions and creating two custom "detailed resolutions", then using "Automatic(CRT)" timings. They are listed by CRU as 100.003Hz and 100.002Hz respectively. Now if I would add more(higher) resolutions, then those resolutions would also alter lower resolutions. Dependent on new resolution timings, if they would be bit different for lower resolutions(like 100.005Hz for 640 or 100.009Hz for 800), then I could select from two in Windows refresh selection box, but if they would be exactly same(like 100.003Hz and 100.003Hz) then only one would show, the one that came from higher resolution. And all those are not sharp at all. I have tried plenty of different manual timing settings but I am unable to recreate "sharpness" effect that comes with special 640x480 and 800x600 timings. I have tried those resolutions using other refresh rates, ie. 120Hz, 85Hz, 75Hz, 72Hz 60Hz but the "sharpness" effect is not there.

My question is, what kind of timings should I use for various resolutions to make things look sharper? I wanted to run full range of resolutions and refresh rates but it seems that only when timings are set manually the image is bearable.

Note that I am using integrated VGA GPU, Intel HD630 while I can sometimes force graphics to be parsed from dedicated Nvidia Geforce GPU but it doesn't change screen sharpness. Also, I still believe that Windows 10 has a lot to do with it, given that my monitor EDID while detected by monitor name is still giving me rather poor default options. I remember doing 1280x1024@120Hz or 1600x1200@85Hz on older Windows, that's beyond official specs. In fact I can't even get 1600x1200@75Hz which is listed by manufacturer as supported. And the monitor was very sharp on every resolution when I was using it 15 years ago.

EDIT: To add to this, the image is sharper when horizontal refresh is bit lower than it should be. But not at interlaced levels(horizontal lines artifacts). Is there any way of forcing some sort of resolution that would use normal values for vertical Hz but lowered ones for horizontal Hz? For example FV: 100.3Hz / FH: 70.3Hz(default) is bad but FV: 100.2Hz / FH: 63.1Hz is good.