Should read : I just found that anything under that,* on this particular guitar, with the way it's been setup, and how level the frets are*, decreases sustain and generates more buzz.
Nope - I meant for all my guitars. I currently own 6. The same applies to my previous guitars and probably every other guitar in the world. I should have said I set my action close to 1/16" in my original post. 3/64" is the lowest I go but that's a personal preference. Lower action means less sustain and more buzz - I don't care what you say - I trust my ears. I'm real picky when it comes to string buzz. I tolerate very little of it, distortion or no distortion. That's why I play with heavier gauge strings. Remember that the action is largely dependent on how the player attacks the strings.
You could go lower but you need a low radius on the fretboard if you'll be doing any wide bends in the high registers. That's what the post is about - What is the trick to low action? Also, with more string mass (i.e. 10 gauge strings) you can get more sustain and the buzz won't be as prominent.