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If you have sufficient lube, as in watery grit, then the only reason they will stick is that the discs aren't matched up perfectly from rough grinding. Possibly they match up COC and thus you get a good sharpie test, but trying to move off centre air can't get in as they mis-match and a vacuum is formed locking everything up.
You have 3 options, go back to 25 micron and grind slowly and carefully aiming for 100% match, persevere with 12 micron, it will eventually come good, or put a flash polish on the mirror and do a KE test to see where you're at.
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