Turntable adjustment

I've recently acquired a Technics SL-QD33 turntable with a p-mount cartridge. Anti-skate is factory set and non adjustable. Also, its fully automatic. Everything worked fine with the stock cartridge, but I wanted to upgrade so I purchased the Grado Prestige Green cartridge, which has improved the sound.  However, now when I start to play an album, the tone arm no longer places the stylus in the groove, thus, it slides off the record. What can be done to address this issue?