By going overhead with casting gear there is a point where the rod is vertical and there is slack line and no weight on the spool thus causing a backlash. Try side arm or rolling the wrist.
A cast made with the proper mechanics, ie, the angler allows the weight of the lure to load the rod, regardless of the plane (overhand, sidearm, underhand,etc.), will never lead to a backlash.
However, I know and have done what you have described. That type of cast, usually comes initially from people who come from start learning to use casting gear that come from a spinning background.
Unfortunately, that same "sloppy" for lack of a better term, mechanics of failing to allow the weight of the lure to load the rod properly has absolutely no consequence with spinning gear. You will also usually hear the rod "whip and whiz" passed the ear with an overhead cast well before the rod's tip gets loaded by the lure.
If you're compensating with settings on the reel to make up for going over-head (no matter what there is a point where there is slack) then are not getting the most out of your casts in terms of distance.
