I don't want to seem unfriendly, and I am certainly not throwing rocks, but perhaps your riding technique needs a little honing, or your suspension settings are not optimal. If this is happening frequently, you are either riding very hard, using poor technique, or have a suspension/tire issue. The Spyder corners best when the front tire pressure is set a little higher than the scant 15 psi the manual recommends. Try 18-20 psi up front. The front spring pre-load should be adjusted for the rider/passenger load normally carried. For most riders the factory setting is a bit soft, and for the 2010 RT the damping is inadequate. For a 2011/2012 RT, try 4 or 5 on the preload...definitely 5 if you carry a passenger. For a 2010, consider 2011 shocks or aftermarket units. The rear airbag doesn't directly enter into the equation, but it must be set high enough, or the soft rear can induce bad behavior. Check to see that it is holding air, and set it to a sufficient ride-height or pressure to stiffen it a bit. I'd try at least 40 psi or the mid-height setting, more if the rider/passenger load is heavier than average.
Rider technique is critical for good cornering. The rider should lean his/her upper body into the turn, compensating for the G-forces. Think of it as trying to kiss the knuckles of your inside hand. For aggressive cornering, this weight shifting is critical, and can be enhanced by shifting your weight off the seat to the inside. The passenger can help, too, but must do so in a controlled fashion. Having the passenger look over the rider's inside shoulder in a turn seems to work about the best. To be honest, from your description, it sounds like you may be just trying too hard. Corrective steering measures shouldn't be necessary. Smooth moves are the safest and fastest way through the corners.
Beyond this, if you think the VSS is not working properly, you should see your dealer. They can zero and test the steering and yaw sensors. I doubt they are malfunctioning, though. The VSS fault warning seems to be pretty sensitive. Keep in mind that the Spyder will allow the inside tire to raise a tiny bit during aggressive cornering. Miss Nanny is not an autopilot, and she needs input before she acts.
