No, a 70-80# BowTech bow backed off to 70# would not shoot the same speed as a 60-70# maxed out. [X(]
The reason being that when you back off the limb bolts you are effectively changing the angle of the limb in relation to the riser
.
You design a bow to work at a predetermined limb angle and preload
. This is the reason you see so many different angles of risers where the pocket bolts on.
A pivoting pocket is designed to keep the limb from shifting side - side when the limb is backed out[8D]. The limb is fully trapped in the pocket regardless of draw #.
This is my opinion on BowTech bows, I' ve tested other bows and found this to be true of them also.