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Seriously Nick,
get the score and study it. The beauty of Bach is his inherent logic. Nothing is there by chance, everything fits.
When you look at the score, the dynamics become obvious. Just imagine a natural trumpet in high F - it doesn't get any tougher than that. There is no pianissimo in the stratosphere and Bach knew that. I believe many of the tutti passages are there to let the trumpet player "relax" by playing low notes.
The arpeggio C, e, g, c, g e, C a couple of bars before the high d in the 3rd movement, I play more like a military fanfare - it loosens the chops up and I am sure that Bach did not put them there for lack of any other ideas!

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Whenever I feel blue, I start breathing again.