There is some danger of the tail wagging the dog if one alters the UTB to suit the fingerboard extension. I can think of more than one good reason to keep some arch in the upper bout. I am surprised to hear than so many address this as a problem since I have never noticed any issue. Perhaps it is because I use a relatively flat top, but I use double the arch in my UTB than I do in my other top braces specifically to tighten the upper bout. IMO this is quite important, if anything is.
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