Nice! I gave it a try as well but my overall tournament finishes were 8th and then 6th. Still messing around mostly and I got to be a bit more careful with pushing my driver.
How do you give commands most of the time? I tried these things:
1) Set overall behavior to "push the race" for laps 1 & 2, set it to "push it hard" for the 3rd lap. First I tried mostly using the slipstream and overtake commands but that was not really getting anywhere.
2) Second try I set the same behavior but I used accelerate a LOT, also in combinations with the left/right lane switching. Usually I released accelerate before a corner a little later than other AI drivers so my Bob got faster into the corner and hopefully could overtake also while doing it. The risk here is to keep it pressed a bit too long though so Bob spins out (which happened quite often since I was really pushing him a bit too hard). To exit a corner, push accelerate once Bob finished braking into the corner so that his exit speed is faster. Very occasionally I also used overtake and slipstream but not often, it seemed easier to just overtake "myself" by pressing accelerate together with switching lanes.
3) What I also tried on the 1st Silverstone race was to set Bob to "push it hard" directly at the start and gave no input whatsoever. He finished 7th which was not bad either. The few times I watched the TV screen I saw him sometimes trying to overtake (being next to a car) but not really making it, maybe with a little of bit of accelerate input I could make him get those overtakes.
The Red Bull series is the only set of races in career mode where I didn't get all the stars yet simply because I dislike driving the Red Bull X-catalogue myself, it's just way too fast and futuristic to be any kind of fun for me. So maybe I could use Bob to get those done so he can be of more use than just grinding credits.