Glad you had a good time and you did great!
It makes you wonder why you didn't autocross before... Huh?
You need to use the WHOLE track with our cars. You were hugging the inside of those first two sweeping corners. Letting the car drift to the outside on the sweepers allows you to enter the corner faster and also to get back into the power sooner at the exit.
Dont worry, you dont need to protect the inside line... Nobody will pass you in autocross.
What tires are you getting?