Bobcats and 1521 are the same thing. I wouldnt run Bobcats on the track though, they will glaze.
PFC Z-rated are ok for all around pad, but you'll be leaving performance on the table for the track. Just swap pads and be done with it. PFC01/06/08 on track and PFC Z-rated for street/autoX.
2004 Mystic Blue #121 NASA GTS3 Racecar
2003.5 Mystic Blue Street Car