dam brian my eyes are watering for reading lol. i'm not a chassie guy but i counldn't get my cal-tracs to work without them. the car would load and then unload with singles. as so as i installed doubles and adjusted the rebound it stoped unloading. i had this same talk with keith from skinnykid racecars and he uses doubles on everything he builds. after reading your post i'm wondering even more about the topic thanks alot brian make me more confused lol.