String Action
General mountain dulcimer or music discussions
I am not sure about the "one size" anecdote, but dramatically changing string size will dramatically change intonation. In the past, when I have already installed a fixed bridge, and it is only off by a couple cents, I will sometimes file a slot or two slightly deeper to adjust it. Not my favorite solution, but it shouldn't affect playability very much. For that reason, I recommend taking a tuner and fretting each note to see if the instrument is well intonated. If all the notes are in tune, I'd say leave it alone. If they're not, then it may be fair to assume that the strings are at different heights due to imprecision.
Nate