I'm 6'3" and I think i'll have to go the shortening route too!
The good thing is the dual circuit booster requires less travel.(So safety shouldn't be an issue)
Did you guys who shortened yours simply cut the arm at the pad and re-weld the pad after shortening?

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.