OK, I finally have my sample re-recorded in a format matching your file. Details are the same as before. (I set the Tascam inputs to "bypass" and used the Callisto to attenuate the signal. Levels are the same.) The only change is as I was swapping cables around I noticed how disgusting the connectors on the Dominus RCA looked and decided to clean them. The Tascam recorded at 176.4 and I cut it down to 88.2.
I will use this file to compare directly to your 88.2 file on my tascam after my headache goes away and give a report on what differences I hear.