I fiddled with the wheelbase, but ended up going back to the middle in the rear. I did move the front hubs from middle to full down though, as I felt I was lacking forward bite. Looking back it's because of the battery position, and the amount of weight I run up front (Avid rack, 14g in the front bulkhead, and 14g under the servo arm). That was my first race in several months, so I'm a bit rusty, but it's coming back.