This happens every event. As soon as I post results, someone says they weren’t off course or hit cones on this or that run. From now on, if your times matter to you, stick around at the event, check your times, and let me know then and there.
As for why you finished so low - part of it is tires, and part of it is not pushing your car harder. Are you riding along with better drivers to get a perspective of what you should be doing?