How can I pin down the resolution on a multi-monitor setup? (one screen is 150%, other is 100%)

I recently got another monitor, a big 42" 4k screen from the local grocery store.

Thing is, in order for it to be usable as such, I have to set windows' display management to render windows at 150% so I can see things clearly enough to read text'n'stuff. My old display is still at 100%.

When I build under this environment, and specify a set windowed, non-resizable resolution (1280x720), it looks okay on one screen, but changes when dragged to another. Repeated builds can result in it getting smaller and smaller and smaller..

My current workaround is to place this code in an update:

 if(Screen.height != 720)
         {
             Screen.SetResolution(1280, 720, false);
         }

It works, but flashes when moved from one screen to another.

Is there a more elegant solution to this scenario?

This is occuring under 2020.3.25f1