i see it as both arms are connected through the shoulders / upper back so by trying to force one to stay out front whilst the other comes over i am actively working against the natural connection.
i read te ocean walker thread and have been focussing on turning the arms over from the hips/ body, had some great success last night in the pool.
I found that i was really overextending and had to work at holding back the extention after years of "long stroking"
When i foud best was to focus on only extending to the elbow which keeps the forearm and hand relaxed and useable
i brought my entry back to about 1 foot in front of the head which considerably reduced my effort levels
I ended the session with a nice discovery of "riding the elbows" from entry to extention which added stability and all round relaxedness