qwerty,
I assume you're using the keyboard as steering device, or plenty of steering help if you're using a wheel. I noticed in testing with the keyboard that it required a slight effort to stay in the pitlane while exiting the pit, which is rather odd since the AI cars stay centered in the pitlane. I found no command in the track editor that could somehow compensate for this but at least it's still driveable with a little concentration.
And thanks for the compliments. With GP4 out, I'm just glad there are still some GP3 players around to use the new track.
P.S. The SW version should appear soon. You SW guys have not been forgotten.