I did a test-track with similar pitlane. BTB generated AIW worked perfectly. But when i redid fastline/pitline in rFactor AIW editor the problem appeared. I did manage to get Guitarman AIW editor working but since it's very complicated, i couldn't understand anything. One thing popped out: wp_perp was 0,0,0 all along the pitline. I loaded some working tracks and they had values in that box. I don't know what that does..
There's problems with BTB generated AIW, it's nearly impossible to get a working fastline done there. And if i redo the fastline in rFactor, i need to redo the pitline too... I have no idea why it does what it does but i can give you the original BTB AIW. But now i need to do those race stint practices for PrestoGP so i'll send that file tomorrow.