While it is difficult to provide the advise you seek without seeing your motion, I would suggest you look at the following for starters:
1. Lack of Extensor Action
2. Overly Agressive Hip Turn (Slide) which may cause your Right Shoulder to move too vertically at Start Down, rather than Down Plane. If the Right Shoulder doesn't move Down Plane (Down and OUT) your may run out of Right Arm by the time you get to the ball.
3. Your Off Plane Motion to get to the Top (above Plane) creates momentum that forces your Arms to drop below Plane at Start Down: similar to a Reverse Loop (10-7-E) or a Reverse Loop Shift (10-7-G) but both Under Plane.
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