I'm using the dmt 320 to lap my new blue i got from howard. however, i'm wondering if i'm doing something wrong because as i'm lapping the dmt is leaving some pretty bad scratch marks on stone. am i doing something wrong? are the scratches supposed to be that bad, or does that mean those are the high spots and i just have to keep going? will the deep scratch marks go away. the yellow bout i got from howard, which he lapped does not have the scratch marks like i'm leaving on the blue. help!!!!!