As mentioned in my dead (now living) '28 post the '28 gearing is pretty low so you can end up on the stop in 6th pretty easy which we're fairly paranoid about (and not without good reason), but surely if you change the ratio to say 15/41 thus effectively increasing the top speed by around 7% and reducing the likelyhood of running flat out you don't actually change anything at all, the engine is still under the same load at 120mph no matter what.
Thus if you changed the gearing to 15/38 you'd end up at about the same rev's in 5th as you had in 6th running 15/44 and thus the same dilema but in a gear lower?
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