Straightarrow,

With todays modern bows at 65% let off and less poundage: the less than perfect hit will be no different than 75% let off. Remember the 65% let off increases stored energy which increases speed slightly. Once you shoot 65% next to 75% you can hardly tell the difference anyway. You will have no trouble even if you just reduce your draw wieght to 65#. One of your best judges of KE is arrow speed. You should always chonograph your set ups and know what speed you are shooting. IMO anything over 280 fps is less forgiving.