Hi SchueyFan!
I don´t use the tracks with TSM and it happens on Istanbul, Silverstone, Monaco and Monza. But I will test the other tracks in short time. If these mistakes happen there too I will write it in here.
In the most corners of these tracks I have oversteering if I use the standard GP4 car setups. If I make my own setups, driving makes fun.
And if I drive a race in Silverstone there is no pit crew if I want to make a Pit Stop. The old tyres dissapear and I get new ones and also the fuel tank gets refilled. But without pit crew.
I have found a GP4 2009 Mod on www.speedinlive.com. Most of the tracks used in this mod are from your trackpack, but josekast did other .DAT files. So I can drive Istanbul with the standard car setup but there is a bug with the pit lane. Most of the KI Drivers crash in the wall at the beginning of the pit lane. In Silverstone there is still no pit crew. In Monza I can drive with the standard setup, but the pit lane goes through the wall with this files. I haven´t tested Monaco until now. I reported Josekast these errors.
If you want to, you can write Josekast and you can both help together to fix these problems. If you could fix these bugs it would be nice to upload a new version of the Trackpack!
And thank you very much for taking note of me and helping me with my problems. Very good "support"!