Shocked to find out the Graham tools aren't 100% accurate.Heh. I've never used the headshell jig when setting up Graham arms. Even before the Mint arrived on the scene I got superior results with on-platter protractors. The jig is quick, easy and idiot-proof, but given its self-evident limitations it was never particularly accurate.
Of course nothing is 100%, especially in vinyl, but the Mint gets us all orders of magnitude closer. Glad to hear you're enjoying fresh music!