Most of my instruments are archtop (13 in all counting mandos, fiddles and guitars). I have a few different bridge fitting jigs I use to get as close to perfect fit as I can. I can't quantify/correlate a % imperfect fit to a % loss of sound transmission. But it's worth it to me to do my best to get a good fit.
One issue is the slight deflection in both the bridge base and the soundboard that occurs when you tune up to pitch vs the zero deflection present when using the jig, sandpaper and soundboard to fit the bridge to the unstrung soundboard. I don't know a good way around that besides trial and mistrial and multiple fitting, tuneup, measure gap, slack strings, refit, etc.
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