The calculations for pitting in the wet need a little work. They're bang on at most tracks, but due to the wear being different depending on the track, there are some tracks at certain distances, where the AI stop in wet and the player can get away without stopping if they're careful. Trying the same strategy on a different circuit probably won't work out. I ran the same plan the other day, and held a place way higher than my William should have managed, but then two laps from the end my tyres were shot, and I started going backwards. The nice thing was, I finished only one or two places higher than I would have managed had I stopped for new tyres.