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When going to a low grit like that I always use a layer of tape. Even if I'm not going to use it at the later stages. Just in case you didn't think of it. Also check the wear on the tape every so...

I have a 325 diamond plate that I use for lapping. On 1 occasion I used it to help take out a severe chip in a wedge. I also have a 600 grit diamond plate and have used it to assist in cleaning up...