If you have the agx's compressed farther than they should be then they won't last you real long. If you aren't droping more than an inch and a half you'll be fine. The beauty of adjustable suspesion is that you can dial in more oversteer or understeer on track days and return it to neutral for the street. My top adjustable 4ways are great for the occasional track session.

Having an open diff will, of course, limit what you can do, but at least better suspension will help you plant the tires.