Impressive that you had another 1.5 secs to give -- sounds to me like you have a winning bit of skill at your disposal.
Unlike the Super Challenge where class winners and top pax drivers run off the ProSolo pax index and every run needs be all out, the Bonus Challenge works off each driver's individual best time as their index. And if you break out, your new index is penalized 1.5 times the break out.
My index was 33.695. During runs me LS course best time was 33.430 and my best RS course time was 32.991 + 1 cone, so yes I had time on my side with my index. I knew I could run better than 33.695 on both sides.
Was I sandbagging... well no, but yes. I would have much rather taken home 3rd place class ProSolo points.
Bollenbec, my final opponent was in the same boat as me, but he broke out on his 3rd runs by ~0.6 secs, so carried a ~0.9 sec index penalty. And then he still found time.
Hugely entertaining and challenging. Hence the name.