I've been listening again to Abbado's earlier Chicago M6 on Spotify. It's really very good - the corporate sound of the orchestra is mostly excellent. However, other than the timpani, the percussion are too recessed and are overpowered by all that noise from the brass (albeit, very good brass). Gordon Peters probably covered the bass drum. He was a great percussionist, but I felt that he often times underplayed the bass drum in the context of that orchestra. The gong is sometimes there, sometimes not. The fellow who covered cymbals in those days consistently sounded awful, regardless of which pairs of cymbals he used (he'd have a table with about five pairs of cymbals - each worse sounding than the last pair). Also, I don't think Abbado doubled the cymbals on those two last cymbal crashes in the final 'charge' section of the finale. Maybe so, but it doesn't show. If that weren't enough, the cowbells are generally too distant.
As good as this performance is, it's comes off a bit as a symphony for brass and timpani. In a way, it's a bit too Bruckner like. For those of you who may own the Japanese shm-sacd pressing of this, are the balances corrected at all? . . . I realize there's only so much 'restoration' they can do. Any input is welcome.