Apologies for leaving this thread hanging.
With higher DPI monitors the issue of blocky bitmap fonts it less noticeable (but still not ideal) which could explain why some monitors look better than others. Windows DPI scaling has a hand here depending on how its configured.
However for those that want to apply the change I mentioned, the change is simple and works system wide, so will make any applications using MS San Serif render with a scalable modern font. I've never experienced an issue from doing for various applications for many years, although theoretically an application could do some odd font metric calculations and display oddly. As a developer myself I can say that would be very odd thing to do as fonts vary with systems anyway but as always take care when editing the Windows registry and do this at your own risk.
The change is specifying a font substitution using the mechanism built into Windows. I've attached a zip with two '.reg' registry files (that can be opened in NotePad or other editor to review the change) that will add or remove the change if required by double clicking the file required to run. Note: I could not attach a zip named file directly so added a '.txt' extension that needs to be removed.
If you prefer not to run the files, this change can be done by running regedit.exe and then navigating to:
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes
Right click either the 'FontSubtitutes' item in the tree or empty space in the list on the right and select 'New' and then 'String value'. Name the value 'MS Sans Serif' and set the value to 'Microsoft Sans Serif'. You can choose another font such as Tahoma.
After that it is necessary log out of Windows and log back in for the change to take effect.
Some more major Windows upgrades can reset these substitutes so the change may need to be reapplied.
With reference to the other change for making DAS use modern windows style visual control rendering, this requires editing the DAS Trader executable file or another system wide change. I've found one area of DAS (Trade Signal feature) where this causes an issue so I wouldn't recommend at present. I tested this mainly to see if DAS would have to do much work for the visual style change before I submitted the suggestion to them, and it appears not.
RegFilesToAddOrRemoveFontFix.zip.txt