Ok so it seems that decimation master won't let me decimate to the amount I want. For example. If I grab the zbrush demohead, subdivide it up to 3.6 million, then try to decimate it by 50%, it says all I can take off is 3644? Anyone encountered this? I haven't had to use zbrush in awhile, the last place I worked I think we were using 3.5. This is Zbrush4R2.
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Also, try going lower, around 10-15%, in some cases, decimation can actually increase the polycount if you don't put it low enough, I recall a 2M model of mine actually jumped to 5M when I decimated it to 75%, since ZB uses average-additive/subtractive formula's for the faces.
If that still doesn't work, post up a screenshot.