I use Sound Forge and normalize to 98.14% (not sure what the dB value of that is), and then dither with iZotope's mbit process. I never noticed any clipping after dithering.
Looks like 98.14% is about -0.16dB.
I was just coming to post that!
I'm curious as to the math behind y'all coming up with that number. Care to enlighten me?