Ok, update on this. I got ahold of the testing specs for how to check what's normal blow-by from the compressor.
The procedure is:
Remove the input airline at the dryer
Run the engine at fast idle so that the compressor runs (you'll have to dump your air bags in order to trigger the compressor to come on)
Hold the air line in one place, about 2-3" over a white sheet of paper for 5 minutes
Draw a 2.76" diameter circle around the oil spot
Compare to the attached info from Cummins based on the age of your compressor and the amount of oil on the paper.
I've also attached what mine looked like so you can compare.
So it looks like everything is fine with mine! I'm happy with the results!
Hope this info helps someone else sometime.
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