yes grb, it would be nice to get longer samples, like 30 minutes of each your station and the 8100.
maybe it will imposible with SS and my today setup
maybe it will be. you NEED composite clipping to get as loud as the 8100 because it's using it too. I've recommended the Modulation Sciences CP 803 before, because you can find them used for decent prices. using that you will get louder AND cleaner than an 8100.
but actually, if you want to, what i can suggest is trying to buy a used Optimod 8000. they have almost the same final section, and you can mod it so that you're inputting right into the pre-emphasis section in it (bypassing the limiters), and get an MPX out from that.