kwalker5 ... I consider myself an experienced rider. Almost 200K miles on two wheels, a 20 year break due to accident, and now nearly 3K miles on my 2012RT Limited. I see from previous posts, you have reviewed the do's and don'ts and that others have talked about the ball joint issue. Is your spyder darting all over the road like it has a mind of it's own? If so, my experience (and posts here on spyderlovers) tell me it is either the ball joints / alignment or the rider trying to over control the bike. So, first I would push the dealer a little to be sure that all is truly okay with the front end of the bike.
Then, take a look at the owners manual and find the pages that show recommended "course" to layout in a parking lot ... I encourage you to do this, it will help build your confidence in your ability to maintain control and relax. When running the "course" and executing turns, keep your head up and look towards where you want to go. Don't look at the edge of the turn / road or you will end up heading that direction (this is probably why you feel like you are going to drive off the road, you are unintentionally looking that direction ... a common mistake for new riders). Do not feel bad, and do not give up, with practice in a safe and controlled environment you will learn to ride the spyder and enjoy it.
Finally, if you can find a "trike" class this would be the best way to learn safe riding techniques in a controlled environment. Some Harley dealers are offering the Motorcycle Safety Foundation three-wheeled class and it is WELL WORTH THE TIME AND MONEY! Even with all my experience, I decided to take the class because my own fear after my accident was threatening my ride enjoyment. I still carry some fear with me when I ride, but it is manageable with the techniques I learned in class and probably healthy as it keeps me alert and looking all the time.
Take your time, don't push, and practice, practice, practice ... it will come to you in time. Best Regards ... Ann