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Hi Jarrod,
A good trick to control grit contamination is to varnish/paint your stand before you start and if washing between grits won't clean it properly, just give it another coat of varnish/paint to seal the little buggers in.
Also, for hogging (getting rid of excess glass), I would recommend a steel tool of about 2/3 blank diameter. Below is a picture of one of my hogger tools. Nothing fancy, just some 3mm steel glued to some ply and cross hatched with an angle grinder.
Once you are at depth you then fix the tiles to the plaster using the hogged mirror blank as the former and away you go. Also, there is no need to chamfer the tiles, but make sure you chamfer both sides of the blank.
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