You are an exception and I hope your G6 come out right for you. According to their chart, I should be in a 36" but after trying on some 34"s at a shop, I ordered me some 35" GT2s. Because I'm not wearing a boot strap, I could get away with a 34", maybe, but the 35" seems spot on and with break in at the boot in the next year or two, they shot be dialled in perfectly.
I don't see why they still use overall body height as a factor. You can line up 3-4 guys at 6'2 and they might all need a different size pad based on their own FTK.