One other good tool is Nratings, you can import ratings for each race but I wont go over that here. But by now if you are racing on new series like the Sprint Cup Series there are newer tracks that are better optimized.
I found by default the AI needs adjustments at least on the default tracks Papyrus have gave us. Thought I would share some tips on making the AI realistic as possible, it makes for better racing and if you have the trouble of the AI being too easy it can be useful if you are doing offline racing against the AI.
