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Hi Ralph
I don't think one wet would change the Sagitta much. I suspect your strokes might be a bit short, try lengthening them a little. If it were me, I would go back to 80 grit and get the Sagitta as close as possible. Then swap between tool on top and bottom for the rest of grinding to keep the RC close.
How are you measuring the Sagitta?
There is a sticky thread on mirror making. You may want to post your questions there.
Good luck!
Rod
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