Start with your ball lower, and drop your left shoulder as your swing goes up. You can go vertical if you do this. The left shoulder is the key....watch the pro's and you'll see.
The danger is, of course, that this adds in another gross motor movement and thus complicates the swing plane and amount of coordination to stay on target....higher you go, the harder (in general) it is to be consistent.
Mine is only slightly higher than parallel to the lane surface, because any higher and my accuracy goes to crap.
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