Mujitsu and Tairaku's Shakuhachi BBQ

So, I'll admit it: other than my Yuu, I've only ever played one professional Shakuhachi, belonging to a local player. I only played it for a minute, but it was of very high quality, and a real beauty. I didn't have time to notice when I had it, but I was wondering something about the edge of the Utaguchi: is it better to have the edge be sharp, or rounded just a tad?

I ask because, when I make flutes, I'm always trying to get the edge nice and super-crisp, which sometimes isn't quite possible (due to the cells in bamboo being so random), and I end up taking too much off, with little nicks here and there. This has happened a few times, and I've ruined decent pieces of boo because of it, or I had to go to the next node and make a much smaller flute.

I've seen some pics of utaguchi that didn't seem all that sharp, with just a tiny bit of roundness to them. Does this roundnedd make it easier or harder to play? It would help cut down on the possibility of nicks.

Any information would be very helpful. Thanks!

-Eddie