Haystack is a 35-40 minute TT, I think 17 miles, so long enough you can not just grunt out a tough posture.
Here Jeannie and Ella, a strong local TT team with good form are about to overtake Liz and Greg near a corner with the cones restricting the passing move. They pass quick and were only right behind the draft for 10-15 seconds due to the cones. They likely took the 90 corner in the aero bars if they didn't need to brake (fyi we were on a TT configured demo Paketa with brakes out front of the aero position but these teams both had just aero bars. Even so, I moved to the horns for this same corner). Greg has sat up a bit from the aero to the drops to take the upcoming corner. Liz is still in a good position either holding the captn seat post or the stoker stem with narrow forearms. Both stokers' heads are down on the backs of the captains.