@Amp, you can get three Brs at the start. Two off the hills and one over the gap, theres your third.4th the other gap, after the first gap you can get two along the straight with the boost(not much quicker), the last is on the two pads at the end of the lap, difficult to do. My lap has the three at the start and one down the straight with the boost.
Hope this helps
Edit...Tip , try side shifting for the BR over the first gap
