RiseUp wrote:
Is there anything I can do about this, or is this something hard-coded into XWidget's software that I cannot change?
As I highlighted, Rainmeter uses different units do do layout, you'll certainly need to do some conversion. As per my experience, it is something like 120% difference.
And about the Anti-aliasing, since RM uses D2D it provides better results (of course, you have dedicated hardware, i.e, the GPU to handle these) but XWidget depends on software-based GDI.
DirectDraw uses a different drawing engine (sometimes better) but the GDI really draws things crappy... (blame microshaft here

)
You can certainly tweak many things like shadow, glow, text-frame and all, to make things more legible... But about the quality of Anti-aliasing, certainly there is not much you can do...
However, to improve font smoothing quality, make sure you have enabled ClearType and caliberated it properly. You can find it in personalisation (somewhere near the place you change your wallpaper)
You can also install GDI++, GDIPP, EZGDI or something similar to improve results and this works wonders!