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Dave, lately I've been using the DMTXX to knock off a pencil grid, drawing another grid and doing that on my DGLP. Saves a lot of time and wear on the more expensive plate. Sometimes I just do it...

Actually kevint gave you the real tip. Lap the lapping plate. It may be 120 or maybe like the GDLP 325 but if it is 120 lapping with 80 grit on glass or a granite plate will solve the problem.

I would get with the vendor. Forum member Blaireau loves the naniwa lapping plate and he is a hone collector who actually enjoys lapping his hones to assess the quality of the slurry.