Turning the bow down that much does a few things. The limbs are most likely not seated in the pockets properly anymore. The limbs may be moving side to side when drawn andshot.The cam is severely out of optimum rotation. Speed will suffer not only due to lower draw weight, but the cam being under-rotated. Holding a bow steady when weight is turned down this much can become a problem (at least it is for me when turning a bow down more than a few #). Tension in the stringand cable isless when a 70# bow is turned down to 52# than that in a 52# bow maxed out.