Just downloaded and tested out your circuit. It's very fun and the flow and rythm was great. I tried it out with my Corvette ZR-1 (C6) RM at 400 HP and 1300 kgs with Soft Racing Tires. It was detuned to accommodate the regulations of the GTP FIA GT2 class.
My favorite part was the double sweepers on the back straight right before final turn. A very heavy braking zone after the sweepers. It reminded me a lot of Bathurst, a great challenging course.