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Maybe just continue as before with the #240 and stay on it until the discs mate up, but do a sharpie test to see where you're at. What is the sag at the moment, you should be headed for a tad over 3mm. What are the channels like on the tool? They need to be around at least 1mm deep so it can 'breath', this too can cause lockup.
I recall 'in the old days' I was doing a 16", desperately trying to deepen the centre and ended up wearing the entire mirror too thin.
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