what you are doing is letting your elbow/arm turn toward your body WHICH will cause you to have your hand on the side of the ball during your downswing.
on a side note, i notice that you have NO followthru at all. not sure if you are dropping the ball but a very important thing to have is when the ball passes your slide foot you should be accelerating with a follow thru. all the greats do this including norm duke, jeff carter, and walter ray (off the top of my head that are the most obvious)
the videos on nextlevelbowling.com REALLY helped me understand how as well as why to do certain things.
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tournament average: 219
tweener
medium revs
medium speed
currently throwing
rotogrip rogue cell
lanemasters black pearl
storm t-road pearl
visionary ogre ss, gladiator solid