I figure how the trinity works while Jesus is on earth is where the hand-waving comes in. But I can at least explain the maths (I think). The problem is that you're thinking of it mathematically. The point isn't that Jesus was 100% man and 100% God, the point is that he was really a man, in the full sense of that term, and really God, in the full sense of that term. Of course, I tend heavily towards the Monophysite heresy, so I might be the wrong person to ask 
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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