While touring the factory they told us the middle setting of the rear shock was designed for a load (riders) of 160-200 lb's.
I'm surprised a Spyder Ryder could lift a wheel, that is the whole purpose of the stability control based on the centrally mounted yaw sensor.... if it see's to much yaw (tilting) it is supposed to back off the engine power amongst other things. Sounds like the suspension setup can be changed enough for it to not be affective???
One huge advantage of a shock like the Penske (yes they are expensive, but for good reason... they are complex buggers) is that you can adjust both jounce and rebound rates. If done properly, no matter what, it'll ride flat as a board, never lifting a wheel. The Viper ACR, a club racing version of the Dodge Viper, comes standard with similar shocks to the Penske's (but much higher priced than Penske's).