Talk Me off the Ledge - A cry for help

I got an MMF 2.1 about 3 weeks ago along with some used reggae records in good condition. I cleaned the records and they sounded very good. I bought the Pink Floyd reissue of DSOTM and the vocals sound horrible. Everything else on the record sounds awesome but the vocals are ssssooo sssibilant its hurting my ears. Ive adjusted the tracking weight with a Shure gauge, fixed the azimuth with the included paper graph and played with the VTA to try to make the arm parallel to the record, all with NO SUCCESS. The vocals still sound like crap. My 2.1 came with the Music Hall Tracker/Goldring Elan cartridge and Ive played it close to 40hrs. Could it need more breaking in? Any suggestions on improving the sound? Should I abandon the cartridge and get another one? Thanks for all your help guys!