So I started watching replays and found that a lot of that stuff was my fault as I wasnt holding a line and often cut across someones frontend.
Yeah, I've done that. I suppose it would help having a spotter, which we don't have.
Still, a lot of my spins had been the AI's fault. Now, I know people that like to throw around the Days of Thunder phrase "rubbing is racing", and perhaps to mention "bump drafting", but bump drafting isn't the same as what the AI were dong to me. What
they were doing is "
slam drafting".
In real life bump drafting, the car coming up behind you makes a point of
not ramming you as hard as he can, but rather eases off to perfectly match your speed right on your tail, possibly making very light contact in the process. This is in stark contrast with what the AI enjoyed doing to me - coming up behind me like 10+ MPH faster than me (a speed difference resulting from drafting behind me) and
not easing off behind me but rather just slamming into me as hard as they can impact me.
I also suspect that the bumpers in GT5 are quite a bit more rigid than the real-life bumpers. In real life, if you come up behind me and tap my back end it should give a bit rather than rigidly resisting and upsetting my car.