I just bought a new Dell' Arte dark eyes and the action is just over three and a half millimeters at the 12th fret. I've read that most folks keep the action over four mm.
I've had no buzzing issues and have it strung with Argentine 10's with an 11 and 15 on the first two strings. What's the advantage of having over 4mm relief? I've never owned a guitar with a 26.5 scale, so maybe it's something to do with tension? Thoughts?