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Gary,
You need to deepen the curve a little and hence push the curve out to the edge. Probably just keep going the way you are but slow steps. It is easier to work the edge with a sub diameter lap TOT. A simple way to achieve this is to press a paper annulus between lap and mirror to reduce your lap diameter to 6" . It is easy to press the lap full again over night when you want to. You would really benefit from having the scope constructed so you could star test the mirror at the end of the process.
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