Once they have decided that they are now coming out of the corner they will generally keep it floored if you pull alongside, same with in an actual straight. If they are going into, turning through, or getting aligned for, what they see as a corner then they will park as soon as you get along side, even by an inch.
Zooming in on the map will show them doing this constantly.
If you stay behind, get a run out of the corner but don't catch up to them while they're still thinking about the corner, and are alongside before they start thinking about the next one, they do fight you.
When it comes to race cars, I suspect they just have no comprehension of what downforce is and drive like it isn't there.
AI driver programming is obviously quite difficult, and fascinating. Very tough to balance "aware" and "agressive." They do do some things well but it's easy to notice what they don't. I do think that they really need to rework their basic approach to cornering however.
Probably the wrong thread for this anyway.