[Paddlewise] Control hand that's most efficient

I'm curious about whether there's much support for the following 
comment, from Lightning Paddle's Web site:

  Budding competitive paddlers might want to think about left control 
if they are right handed (and vice versa) as there is informal 
(unsubstantiated?) anatomical / physiological and kinesthetic 
evidence that paddling with the "wrong" hand as control hand is most 
efficient.

As a left-hander, I've been advised to switch to right control anyway 
because (a) it better positions me to use loaners and (b) makes my 
paddle more useful as a loaner or for resale. Efficiency gain would 
be a lot more persuasive, though. ...I can paddle right control in a 
pinch. Just haven't done it with enthusiasm, to date.

Best,

Margot
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