If you are using a pendulum stroke, and drop your shoulder just before contact, you will NOT be hitting with a level cue. There is no way you can be! A pendulum stroke hits the cb with a level stroke at contact. So, any change you do just before that will alter you being level. If you want to drop your elbow, you better do it a ways before contact, not just before.
A quick test, look at your chalk mark on the cb and see if you actually are hitting where you think you are. A training cb is best for it because it shows the chalk marks, and you can easily pick an exact spot to try and hit.
Been going through some of these threads, because I feel that there is much to be learned from most of them. This post stood out to me. Not in any sort of positive or negative way.
I'd say that for the most part I use a standard "pendulum" stroke with no elbow drop. There are times, however, when I do drop my elbow. I can do so with a level cue. The secret is to bend the wrist at contact.
Basically, you're bending your wrist in so that the knuckle of your thumb is pointing more towards the floor instead of straight ahead. If you don't do this when dropping the elbow, then yes, your tip will be aimed higher and you won't be as accurate.
I hope that makes sense.