If it's a Warner CD that sounds harsh, then it must be the mastering. The Japanese mono CD from a few years back was incredibly bright (and loud).
Are you familiar with the 2 CDs worth of alternate and incomplete takes that are available in the trading community?
Art Blakey's Jazz Messengers with Thelonious Monk Atlantic Studios New York, NY May 14-15, 1957 Art Blakey, drums Thelonious Monk, piano Johnny Griffin, tenor saxophone Bill Hardman, trumpet Spanky DeBrest, bass Source: Master tapes Unknown lineage Disc 1 = May 14, 1957 Disc 2 = May 15, 1957 Disc 1 (59:40) 01. <Studio intro> - 0:21 02. Blue Monk (take 1) - 0:10 03. Blue Monk (take 2) - 2:36 04. Blue Monk (take 3) - 0:50 05. Blue Monk (take 4) - 7:50 06. Blue Monk (take 5) - 1:42 07. Blue Monk (take 6) - 7:51 08. Blue Monk (take 7) - 1:26 09. Blue Monk (take 8) - 7:12 10. Blue Monk (take 9) - 7:11 11. Blue Monk (take 10) - 0:10 - ISSUED ALTERNATE TAKE - REMOVED 12. Evidence (take 2) - 0:29 13. Evidence (take 3) - 5:34 14. Evidence (take 4) - 0:09 - ISSUED ALTERNATE TAKE - REMOVED 15. Evidence (take 5) - 1:00 16. Evidence (false start) - 0:21 17. Evidence (take 7) - 6:06 18. Evidence (take 8) - 0:42 19. Evidence (take 10) - 1:25 20. Evidence (false start) - 0:14 21. Evidence (take 11) - 6:11 Disc 2 (23:44) 01. <Studio intro> - 0:10 02. I Mean You (take 1) - 0:14 03. I Mean You (take 2) - 1:21 04. I Mean You (take 3) - 0:07 - ISSUED ALTERNATE TAKE - REMOVED 05. I Mean You (false start) - 0:33 06. I Mean You (take 4) - 1:26 07. I Mean You (take 5) - 1:16 08. Evidence (take 1) - 0:23 09. Evidence (take 2) - 6:29 10. Evidence (take 3) - 1:03 11. Evidence (take 4) - 6:58 12. Evidence (take 5) - 0:25 13. <Studio intro> - 0:10 14. Blue Monk (take 1) - 0:46 15. Blue Monk (take 2) - 0:40 16. Blue Monk (take 3) - 0:48 17. Blue Monk (take 4) - 0:47 Total time = 1 hour 23 minutes 24 seconds