Weird that the AI is misbehaving for you, for me it seems to give me room into the corners and even go through side to side... only a few times did I come out on the wrong end of it by being pushed off the side... maybe GT5's robot AI has conditioned me to avoid their line so I stay out of trouble more than you guys :-)
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--John
i5-2500k@4.8ghz, Asus P8Z68-V Pro/Gen3, 8GB G.Skill@1600, Noctua D14, X-Fi TitaniumHD
MSI 560Ti/448OC 1280MB@900/1800/2250, 3 x P2310H monitors, HAF932, Corsair TX850, Win7x64Pro
TrackIR4, Saitek X52Pro + Pro Rudders + Cessna Trim Wheel (sim flying)
Fanatec GT2 + G27 pedals (sim racing)
PSN/XBL/Steam/EA/ProjectCARS: Kludger
iRacing/rFactor2: Joao Silva