Whoa I didn't even notice that... I guess wasn't paying enough attention. I guess it doesn't really matter where you build the partial cross as long as it's not F or B?
Yi-Fan Wu builds it on U. Walker Welch builds it on the right, despite being right hand dominant I think. I have the same case as Walker except mirrored (i.e. I build the partial cross on left despite being left hand dominant).
Great average anyway, I bet it feels good to get all sub 40 for your first official sub 40 average