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You may have got some contamination from 80 grit. You must ensure that when moving onto a finer grit all traces of the old grit are removed and no containers that were used to house the old grit be simply washed and used for the finer grid. You need new containers. I used different sauce bottle to hold and dispense the wet grit.
Use some plastic drop sheet over the whole surface and under the mirror on the grinding bench. Then when going fine get new drop sheets,
The items that must be reused, such as mirror and tool must be washed thoroughly and again do not use any brush used for coarse scrubbing for the finer powders, get a new brush.
A couple of fine scratches here and there won't hurt too much but too many finer ones and your mirror will suffer in contrast. Of course if your anything like me you'll keep going until that last scratch has gone! Just might take a while. I think 240 grit would have been good to have but of course one uses what one has available and can get by.
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