I’m guessing the sled would also drop down the mountain quicker with heavier guys in it.
If your getting out to 30m time in (3.65), boy that bodyweight must be causing damage in the 2nd half.
I remember once hearing one of the reasons that Jason Gardener (75kg/165lbs) opted/preferred the 60m over the 100m was because of his low bodyweight, but he referred to low bodyweight helping his acceleration in that interview not top end.
You lose 30lbs, maintain strength, you will should get the 6.7 I’m sure, but if its an issue going that low, then…
sucks.