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O.K., now I understand, sorry, put a "clean , unused 1500 or above" on the 4k side with only a few strokes/swirls.

Could some of the sand left the bonding of your paper?

Some thoughts to compare, I don't drop below 325(I use a DMT) to lap & i finish (after it's flat with 1500 wet/dry wrapped around my DMT) ; now back to your problem, pencil it as in the video, it...

Sorry if this is a dumb question, I tried to answer this with GOOGLE; is this paper you are using a wet/dry paper? Are you lapping under water?

Hang in there, take a break, ,,,what grit & type of paper are you using??/

If you get the opportunity to get a DMT-325, here is a lapping video just out for you to look at;


http://www.youtube.com/watch?v=