I was seeing similar results with the inability to finish the race.
I started having my flyers go 50’s at 2nd half speed. He was going 56.5 (25.6 and 30.9 )
After a couple of weeks going 50’s on 1 min focusing on 2nd 50 speed , he dropped to 53.8 in season ( 24.6 and 29.9 ) without a shave or tech suit. In fact we had not unloaded either.
Good luck the rest of the season,
Chris