I'm with you on this one Billy. The S speed rating approves the tire for 10 minutes at 112 mph, and as you don't drive that fast, it's perfectly safe. Load ratings are also specified on tires, numerically, and that's an entirely different rating UNRELATED to speed ratings. You're perfectly safe with the Symmetry, assuming that it's load rating is also sufficient for the car. You can look that up online easily, and more than likely it meets the requirements of the LS weight.
I recall that this board has been around this topic, if one can call it that, many times. The facts are out there.
Thanks SRK, I feel better now. I didnt want to think I have been running on the ragged edge all this time...