I was discussing the very same thing yesterday and was advised that I would lose too much DOF with the 2x tc and should stick to 1.4x tc.
I am going to borrow a tc later this week to experiment with so will decide after that.
Let me know how you get on.
Rin x
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Rainy days are for browsing BF, WPF........what did I do before I got my PC? 
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