I didn't read any of the responses before I listened. I went from track to track at the same point in the song on two different sets of phones, K-240s and M-40s. The M-40s are a LOT louder. (My monitors are put away right now).
So. I did think the pre-master sounded good but for the mastered tracks I was torn between 3 and 6. After a lot of back and forth I chose 3 with 6 a close second, 5 after that. I didn't like 2 or 4 simply because they were too quiet using an Octa-Capture and the K-240s. I had the Main Output on the OC set to 3:00 using the K-240 but had to back off to 12:00/1:00 using the M-40s.
Comparing quiet passages and loud passages I just thought everything sounded better, by a hair, on 3.
My hearing is rolling off on the high end too... and my feet are cold.
J