In Window 10, using MFC, I have a dialog in my app that displays at different sizes in different situations. In "Simple" mode it's a fixed size with fixed sized content, in 'Advanced' mode its re-sizable with (some) resizable elements.
I'm trying to make allow for high DPI situations and DPI scaling not equal to 100%. I'm using a simple scaling factor equal to the DPI scaling (e.g., *1.5 for 150%, etc.) It's not perfect, but works adequately at 100%, 150% and 200%. However, at 125% and 175% something doesn't quite work, and setting my dialog to the fixed size makes it too small for its content. It's almost like it doesn't scale equally in both directions.
Now I could tailor my size/scaling adjustment individually to each DPI scaling setting - but I'm not sure how that would work if the user picks a custom %.
Does anyone have any insight into what is wrong / how to do this correctly?
EDIT...some screenshots:
You can see that none of the dialogs are unusable, but 125 and 175 are a little worse in terms of fitting.
100% 
125% 
150% 
175% 
200% 