200% display magnification *AND* larger icon title font possible?

My notebook computer has a 3200 x 1800 native resolution which at 100% renders mighty tiny desktop icons and text.

In all her wisdom, Mother Microsoft has decreed that 250% resolution is the "(Recommended)" one. Problem is, some "legacy" programs, including WordPerfect and and Opera 12, don't scale well at non-even ratios. At 200% they are razor sharp. At 250% they are fuzzy. The whole point of a 3200 x 1800 screen is razor sharp. Even a few Windows dialog boxes are fuzzy at 250%.

But, my main gripe is that at 200% zoom, the icon titles and title bars default to 9 and the ability to change is greyed out. I would like to use 10 (or possibly 11, not sure because I can't test them.) Only with the zoom set to the "Recommended" 250% can the font size be changed, but it doesn't stick when changing to 200%.

Is it possible to modify a Registry key directly to enable enlarging the font sizes when using 200% zoom? I can't seem to locate an appropriate Registry key.

And/or is there a way to get razor sharp display in all apps at the "Recommended" 250%?

There are no strings or DWORDS in the right pane for PerMonitorSettings. Do you have any suggestions for what to add?

There is a sub-key in the left pane under PerMonitorSettings with a really long name, starting with SDC424A0_... which has one DWORD -- "DpiValue" with a complex rather value (Decimal=4294967294, Hex=0Xfffffffe). That sub-key doesn't seem to lend itself for tweaking, either.

I don't have a problem with the magnification. 200% is exactly what I want, and I can select that from Display. What I want is to unlock the icon font-size when I do that. It's locked at a then-teeny size 9 and greyed-out. At 250%, I it's unlocked and I can select another size. (250% is what Mother Microsoft decrees is "recommended. )