I don't run the Pro's but I know my MT Drag radials like a long smokey burnout. The Caltracs should make a big improvement. Also I run lower tire pressure than many claim that works for them.
I run anywhere from 12 1/2 to 15 lbs. Do you run double adjustable rear shocks. That was the key to really get my 60fts down. The Ranchos are junk with drag radials.