I just checked and those Zipp 2001/3001 frames are illegal under UCI rules. Of course, if we're not adhering to UCI rules, then can I use a Gruber Assist?
I have made one equipment change though - I went to GB's at lunchtime and picked up an 11-25 cassette. The 12 is a bit spinny on the downhill sections of that course. I'm going to leave the 12-27 on for the Dragon though.