03-16-12: Davide256.
............ My suspicion is that your light weight arm is why the other cartridges sounded bad...you need high compliance cartridges which Grado definitely is not and more than likely the others are not also.......
Despite it's looks, the Graham 2.2 is a medium mass arm.
I believe it's effective mass is 11g, which is similar to the Rega and SME V etc. It was designed for use with low to medium compliance cartridges.