I just don't like my AI-Bobs were slacking off once they have a bit lead.
One bad thing about B-Spec was AI will slow down and relax once there's no cars around him.
In real racing (such as F1), once you have a "comfortable" lead such as 20 secs. You don't just relax and let the P2 guy catch up. You either build more gap little by little, or pace the P2 driver at the same pace.