Sounds like you're quiting around impact and/or don't have the right ball position.
Whether i hit or swing the trajectory is similar with hitting actually a little higher
i agree with jim, in hitting i think you would hit the ball higher because of the angled hinging and i dont see how quiting would make you hit it lower unless you where hitting it thin or getting to steep your probably just releasing later than before than when you where swinging so try moving the ball position up