Hello All, I am running a 12R5.1 at kit setup with boosted 10.5 on Jaco 2xPink front and Grey rear. I'm running on low traction outdoor asphalt, I like the current amount of and feel of steering but would like more rear grip. What setup changes should I be trying and what tyres? I've been using CRC or Jaco as they are most availible to me.

P.S. Again the question of is there a chart of colours from soft to hard? Is the Jaco website in order from soft to hard?