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Im using a P2  and engraving old roofing slate tiles. they have been sanded  down with 220 paper to .2mm variance on a 100mm square. (coaster)

Im having an issue with the laser head. If I engrave at 100 dpi the engraving works fine.  I typically raise the laser head .5-1mm above the recommended just for safety sake. (increase material thickness)  My issue is if I run a coaster at 100 dpi it works fine. if I repeat it at 300 dpi the head crashes in to the work. Why is it dropping the head? Specifically, as I have increased the thickness of the piece, why is it trying to bury the head in the slate?  I have 2-3 coaster that have come out and they are stunning but the head is getting beat up. 

Thanks