Doug,
Classic Records has been extremely frustrating to so many of us. As you say, both Solti/'Venice'/LSC 2313 and Gobson/'Witches Brew'/LSC 2225 are examples of hugely disappointing sound quality. And then CR can flip around and create something that is really well done, such as the Reiner Prokofiev/'Lt. Kije'/LSC 2150 or the Heifitz/Rozsa/LSC 2767 to list two out of several. I'm not looking for sound that mimics the original LPs; I'm looking for good sound in its own right with natural timbre and harmonic overtones, and one just cannot trust that Classic Records will deliver it. Perhaps if one knew the sequence in which the CR releases were mastered that could supply a key to the puzzle. Wilma Cozart jerked a knot in their tail over the Mercury reissue project, forcing them to upgrade their mastering chain and to insert tube amps to drive the mastering lathe. But, again, their results were inconsistent.
Speakers Corner has done such a better job overall with the reissues of the Decca catalogue, and now the Mercury catalogue. For that I am very thankful because the Decca's are superb performances with some of the best recording engineering symphonic music has ever received.
I've purchased some of the 45 rpm Classic Records reissues we've listed. If there is interest, I may add my thoughts about them when I've had a chance to listen.