It is definatly hard to overcome the muscle memory part of it, but I think they factor that into the results, plus if you slow down a little it helps.
Interesting note about the thumb over thumb thing, when I was younger I made an effort to switch the way I interlocked my hands. Whenever I notice something like that I wonder which way I normally do it and wonder if I do always do it that way or just happened to have this time...yea I think I'm OCD.
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