Not so. More rake angle generally makes high speed more stable -- but more difficult turning at slow speed. Less rake gives easier slow speed handling but can be unstable at high speeds. Lengthening the forks, ie, raising the front end increases rake. That's why they do it on choppers.
Now if you're talking about raising and lowering the center of gravity, then yes, lower is easier to balance when stopped or going real slow. But you must consider what you've done to the rake angle for handling at any speed above that.