Thanks that's probably a shot from 2008 when I could drive
John sells a great product and if he says his shocks will work then you can trust him.
His shocks work basically the same as your QA1's when I looked them up though so I don't know how much you would be gaining? They are both set with a firm compression and adjustable rebound (extension) to control axle separation. Maybe someone else could chime in.
http://www.qa1.net/qa1_motorsports/d.../r-series.html
http://calvertracing.com/9way.php
What you gain with spending the extra money on some Afcos is full control on bump and rebound. And if you car falls outside of the range of the shock they can be re-valved to fit your needs. They're also rebuildable. It's all my family has used but I think Strange makes good stuff also.
Take some video of the car if you can maybe the forum could offer some help. The only thing more fun then playing with your race car is someone elses..lol