Trying to work it out through shadowing. What should the vertical relationship of the shoulders be during the stroke? I find my left shoulder a bit lower than the right on follow through, which might be why my elbow goes up. If I try keeping it even, the stroke levels out.
Also experimented with a homemade "leverage band". Interesting results- the first part shows how the wrist remains laid back. Then I tried a forehand action- you can hear the velcro rip sound from the strain....
http://youtu.be/XRphkYtEv7o