I don`t think grabbing the arete with the left then rocking to the right works- lack of decent foot holds is the problem.
The start is tricky if you go direct from matching the break to the thin pocket on the face. There is a sneaky heal out right which makes getting up to the thin pocket more manageable.
Regarding the finish of the probelm- Guppy with the left proved key to me. I have not managed/tried bringing left foot on to the starting hand hold/break. If that works then it will make the last move less of a uncontrolled throw. I have only ever done it direct from the position in photo to top with left hand.
This problem is definitely about technique/sequence-on first climbing it i could not believe it was only 7b+. Having said that i campussed the first move and dynoed the last (both of which seem unneccesary!)
Great problem