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I shoot all my 3d setups about the same speed with about the same foc and I know for a fact that my 395. mags drift more in the wind than when I was using Hyperspeeds.
This shaft is about twice the diameter.It is just arrow dynamics and drag.If the arrow catches more air it will drift more.That is where the foc comes into play.The weight helps to fight the effects of the wind.If you go too far with foc ,you will encounter another set of problems.

I do agree that the faster the arrow the less it may drift but their are other things to take into consideration.