SO the RKC workout goes like this( it's also in the book All Time Favorite RKC workouts soon to be released)
Back then I didn't know how to release my lower rhomboids and traps and get my shoulders to stabilize; or release the forerarms for the same effect. Now I do and hope that I can tolerate this powerful move as I now can two hand swings. It's way easier to do high reps than the one arm swing but I will keep them in too. Work your weakpoints and you will get stronger.