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I don't mask, simply because I don't see the benefits outweighing the hassle, and I do contact printing. So take my response for what is worth.
As I understand it USM lowers the contrast range of the negative (the reason why it is recommended to have a contrastier negative). IN the spirit of BTZS I would think we want repeateable, measurable results, and not just a guess. So if I was going to do masking and I was going to do this to all my negatives, I would increase my ES value so that I could substract the mask value. For example, I shoot my negatives to an ES value of 1.5 for pt/pd, if I was to do masking I would and plan to use a mask that has a range of 0.4 I would re set my ES value to 1.9 instead of 1.5. This way I know that once I have substracted the mask value I fall back within my proper ES value, and you don't have to make new curves, you can work with your current curves and just make sure you have a standard "exposing" time to produce a mask with a DR of 0.4.
Hope this makes sense.
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