One of the things that makes Molokai so challenging is that the conditions can vary so dramatically. It can be punishingly hot and flat where athletes must grinding across a mirror like ocean or the wind can blow like a tropical storm and churn the channel into a frothing mess. This year conditions were nearly perfect.
For me, the speed oriented lactic sessions have always been challenging. I love to grind and I will happily punish myself through longer threshold or tempo intervals, but when things get shorter and enter into the realm of lactic pain, I just struggle.