While most people will say that carry is just as good across the 14-16# board, that carry will be different with different weights. Good, just different. Some hits that used to carry (like those weak 5 pins on light hits) won't anymore because the 14# deflects more than the 15#. But other hits that would leave different stuff start to carry (like 9-pins on high hits that the 15# ball just drives past is carried now by the 14# that is deflected by the 5-pin).
Overthrowing could be a problem, especially if you're leaving 5s. The ball isn't given the chance to hook because of the extra speed. Either put a little more hand into it to compensate or try to back the speed down. It might not take much, just slowing your feet a little or holding the ball lower in your stance.
SH