Offset Opacity Mask on Material

Hey, I have setup an Opacity Mask on my material, however, there’s a pixel around the border that appears to not be masked:

Is there a way to offset a pixel so it won’t appear? I’ve tried changing Opacity Mask Clip Value but it won’t change the result.

Use a node called AlphaOffset.

It does help a bit but it doesn’t hide that pixel totally.

For the Offset value I can’t lower more than -2 or the material won’t show:

Any way to process further?