Hi Logan
Don't try channeling the tool at this point. It's only going to invite scratches. Plenty of people make telescope mirrors with a glass blank as the tool - no channels.
Remember to try the easiest solutions first. Vary the mix a bit as discussed. See if that helps. Try a sharpie test. It's easy to do.
When you have done the above report back and then we can discuss what to do or try next.
Rod
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