My best time at Thunderhill is also 2:19. Think I was in a low intermediate group so most of the day traffic was holding me up a little-- due to m3 ability not driver skill
Only have 4 days or so under my belt (2 at t-hill) but times were dropping as the day went on to a best of 2.19. M dynamic mode. DCT. Traction control saved me once in corner 3 I think it was (off camber after long left). Definitely was not braking that aggressive and let off a little early on long straight.
I was going to ask an instructor to ride along to see if he thought I should graduate to intermediate but thought it was better to get more seat time in the lower groups before moving up. It's stressful being one of the slower cars and I find I make mistakes when someone is coming up on me..