Dan. Thanks for explaining your club's SU class - I was going to ask in your other thread.
Yes. SM can be tough. In fact the times at Nationals last year shows that the best SM cars and drivers are right up there with the best CP cars.
But locally, you never know.
If you look at the PhillySCCA event 7 results I was very compeitive in class. (I stopped at 3 runs because we saw the radiator was leaking). But when the real hotshoes in my class are there, its a much tougher day. For example see the link to results for the August event .

Brad, Mitch knows you and your car better, so maybe thinking track days is a good idea. On the other hand, you should still try autocross and work at getting decent at it. It will teach you discipline and precision. Randy Pobst recommends it, so it must be good medicine.
Randy Pobst's "Epiphany: How I found True Speed"