Hrm that does sound shady to me. Have you talk to the Solo II Board Chief? Or Autocross Chief? Unsportsman-like conduct has no place in SCCA or any other racing club.

You can protest by going to those people and see what happens. It is up to you though to keep a cool head when present your evidence or misconduct.

It took me 2-3 years to get into the "circle". I got into that circle because I started beating all the veterans on STREET TIRES! Plus I'm very friendly and easy to approach.

Don't quit though - you will just show them they won and you lost again. Keep your chin up and keep driving. If you get first (which you are close to getting already) you can prove that you are the better driver AND better man for not having to cheat. But also keep a cool head on your shoulders.