Agreed on the internal with Maxxis. I suspect James & Earl are right on with goat, green, or something harsh wiped externally. Goat and Pink Panther 50/50 works nicely when the track is like that. The oils in our Pink Panther keep the tire from drying out when using goat, and you can use Pink Panther as your internal as well. I'm sure James & Earl have their own preferences for internals that work well there also.
On the Outlaw karts there, I know some are needling in our Black Bite 2.0. (Probably because they are picking up some track and laying marbles/dust back down in the groove with their treaded tires.)