I bare shaft tune every new bow I get for arrow spine and nock point. If I have a bow built for me, of course I have it tillered for 3 under. However, I will sometimes buy a used bow or already built new bow, and they are usually tillered for split. In general, all of these bows, whether tillered for split or 3 under, have tuned best with a nock point of about 3/4" for shooting 3 under. Some bows tillered for split will shoot 3 under best with a nock point of 7/8". Some bows tillered for 3 under will shoot best with a nock point of 5/8". All of these bows shoot off the shelf, and other than trying different rest material, I've never tried moving the shelf up or down. A few bows tillered for split could not be satisfactorily tuned to shoot 3 under, and I didn't keep those. Few enough that it doesn't worry me to buy a used bow tillered for split, as I only buy quality bows and have never had a problem re-selling one.
I'm not a quiet freak, although we all have our standards, I'm sure, and I will eventually sell or trade a bow if it's too noisy. There is enough variation in noise levels between different bows that I think the bow makes more difference than whether it's being shot split or 3 under. In fact, the quietest bow I've ever heard is Rod Jenkins's Black Widow which he shoots 3 under, and BW is not known for making particularly quiet bows. Could his super smooth release have something to do with it?