Porpoising is a term we use all the time with the drag race guys but it applies in autocross too. In simple terms what happens is the car hooks then loses traction in quick succession. The most common reason is because the shocks do not have enough extension/rebound dampening. The suspension extends too quickly so it's not applying the power smoothly in the rear which upsets the front. The opposite holds true under braking in regard to the front. That's an oversimplification but hopefully it makes a little bit of sense.
Lino (Psydwaze) will probably be at the 6/9 event in Stockton. I'll have him keep an eye out for you. I have to go to a birthday in SoCal.
Feel free to swing by the factory m-f if you have questions. I know you don't have our parts but we're always happy to help out a local guy.
~Carl
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