Having the same issue with internal Intel HD graphics.

I believe it increases the Win10 default icon size of 24x24 pixels to the previously used size of 32x32.

Windows 10:
34973
With 7+TT
34972

Which is perfect for my liking.

Of course, once...

I think you do. Unless you despise any 3rd party help, try downloading the latest beta of 7+ Taskbar Tweaker.
Run it. Right-click on the icon in your task tray. Select Advanced Options. Scroll down...