Finally found a good decription of all the Pagid compounds for brake pads - took me while to find it.
http://www.braketechnology.com/racecharacteristics.html
The Pagid rep suggested the Sports (blue) pad for "street & light track/auto-x". Local club folks suggested orange for track work. Rep syas the orange needs to be warm to work right, and can be noisy. I will probably try blue first - but open for comments on Pagid in general. All are advertised as rotor friendly, but I have no experience to confirm that.