Your 'Teg didn't look too bad to me, although I didn't really stop to take a good look.
I think I did a 29.5 something on the autotest in the wet, only had one go because the queue was massive!
My lowest score on track was 85% and my best was 93% although I felt my best lap was in the Corsa (only did one lap in it @ 90%) it was just so much more nimble and able to go where you wanted but I was enjoying going around in the Insignia to be honest and wasn't too fussed about waiting for the Corsa! A lot of my comments stated that I was really smooth which I was very happy with! Managed to heel and toe too which no doubt helped. Felt much more confident than I did when I went for the first time 2 years ago, I think my highest then was around 90%.
I'm not actually that great at karting, not as good as my mate who I was there with, the last time we went karting indoors he was a good second quicker than anyone else and he's never really done it more than the occasional karting day, probably less than 5 times, the same as me I think.