UPDATE: as to be expected replacing the 2 MD HD springs with 2 Nobs (full springs) under my heavy Core Power 1800 further improved the music. I played both Blues Brothers, before and after the 2 additional springs. Next up was Billie Holiday Greatest Hits.
Blues Brothers: I could hear much deeper into the sound stage and instruments were easily heard where they were physically on the stage and Dan Aykroyd was positioned more to the right and back from Beluchi, and the sax sounded more full bodied than at any time I've listened to this disc
Billie Holiday: This disc always sounded very good, but now, I was transported to the venue, so lifelike
hth