The Itzulia TT was around 7w/kg for 15 minutes, though this was not the finish yet. very good, but nowhere near 7.4+ w/kg for 20 minutes.
The numbers I have for the Dauphine prologue are so bad that they are almost unrealistic. Either I have the wrong segment, or the hairpins are messing with the estimation. I will have to check that again.
Edit: Regardless of how I look at it, the raw w/kg of the prologue are terrible (Even if I somehow underestimated them). Despite that, the gaps were even quite large, no idea what was going on that day. (Every stage race, a lot of rider seem to underperform on stage 1)