Did pretty well tonight had some caffeine to counter the tiredness and it worked. Two of us were up the road about 10 seconds on everyone, then near the peak the group was about to catch us so I stupidly gave in and let about 25 pass me; the intent was to latch on to the back but they just blew right by. That's a fixable problem though.
This is the first Worlds ride I didn't have a failure and I could actually shift to the big ring. Its amazing the difference it makes.