Finally!
I thought I was never going to get this thing won! I'd spend a lot of time trying to get the Toyota GT-One in the winner's circle, but never got better than fifth. Finally gave up on that and started using the Audi R8 '01, started getting third consistently, but always finishing 5-10 seconds back of the winner.
My Bobs were levels 36 and 29 going into the race I finally won. With the R8, I'd found that, surprisingly, the best pit strategy was to go in at the same time as the leaders (laps 3 and 8). I'd usually go into the first stop in fourth place and come out in third. The Bentley Speed 8 has a slow pit crew apparently. Then for the rest of the race, I'd hang with the two leaders (usually R8's as well) but could never take the lead.
Suddenly, today, a thought occurred to me that probably should have a long time ago: I switched the order of my Bob's. It was always just putting my level 36 Bob first by default, and I didn't give it much thought beyond "that means he'll drive both first and last stints, sounds good."
It had never occurred to me that my higher level Bob would probably handle the rain better than my lower level Bob. So today, I switched the order, and the results were stunning. I again went into the pits in 4th, and came out in 3rd. Then, in between the two stops, my level 36 Bob put on a clinic. By the second pit stop, he was ahead by 54 seconds!
My level 29 Bob gave a few of those back on the last lap, struggling with the Racing tires on a still damp la Sarthe, and my final margin of victory was a still impressive 47 seconds.
So, if anybody else out there is missing the obvious like I did: Have your best Bob drive second!