IMHO Curve logo on app icon should be enlarged to fill up white space and get some Material theme-ing…
Mine is fully enlarged on Android. No white circle around it.
Yes me too, you can maybe choose the right icon in your icon settings :
Sorry it’s in French, but you can see the choice of 2 icon one with white circle and without.
Stock Android launcher doesn’t have this option.
Already shows as full for me (OP6 and NovaLauncher, didn’t change anything, just appeared like this as standard.