One difference between interlock and overlapping is that interlocking puts the palm of the right hand more parallel to the shaft. Thus you need to bend your right wrist more to get the same flying wedge.
I recently read that Jum Furyk uses a double overlap. That will give him even more right wrist bend "for free" than the regular overlap. He said that he got a better transition this way. I am convinced that the wrist bend was a bottle neck for him earlier.
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