Just recently I was running a qa1 single adjustable on a very soft setting starting at zero I was at 6 out of 16.. when the car was producing its best 60 foot... on your guyses advice.. I purchased a set of double adjustable shocks ... and have not been able to produce the same 60 foot.yet I'm working through.. I called to order Springs and this is what was recommended.. for my combination. I'm not saying that it's right.or that any buddies wrong... but one thing's for sure I will figure it out.... I'm not going to throw my hands up and go to a ladder bar or four link. Just like my Ritter block ran.. for two years before anyone else got one running.. and I shared all that information with others.. right now my car is only 1hun slower than the fastest leaf spring car in a class..