If you're talking about autocross (it appears they run autocrosses at Hawkeye Downs, which is a circle track), then your car is in STS but technically only if you take off your Strut brace. You could replace it with a 2 point brace and be legal in STS. The car, as it sits is in SMF just because of the 3-point brace.
In fact, nowhere does the SM rules specifically discuss strut braces, so I am just assuming any strut brace is allowed there.
Anyway, take the brace off, it's not doing anything. If you really feel like you need one, sell it and buy a 2 point brace. Run STS.