I make a little gun shape with my strong hand as it starts to move. Trigger finger is prepositioned to go straight into register and the other four fingers are a bit curled but mostly open, and the thumb is flagged so I can slam the whole hand onto the grip. I balance economy of motion with raw speed in order to maintain margin of error when there is tension. If I try to make the draw path as minimalist as possible, I feel like I get more errors from running my fingers into the belt, etc. when tension causes short-stroking. This is a lot like the argument against letting triggers out to the minimum reset point and no further. Tension leads short-stroking, and when combined with no margin for error sometimes you get trigger freeze. The speed/force involved also helps get the grip fully seated in my hand.
Flagging my thumb is part of establishing master grip that way. It certainly doesn't have to be done that way but that's the way I do it. Getting the hand into position for master grip to be established, but only then wrapping the fingers onto and around the grip, and getting the thumb dug down in between the body and holster, takes a little time IMHO. To whatever extent my draw is fast, I personally believe it to be hugely related to efficiency in establishment of master grip at the beginning and getting to a high level of certainly in aiming at the end. As you can see in the older high speed video that Clobbersaurus posted upthread, the flagged thumb starts dropping over to the left side of the gun just as soon as it starts to lift, and gets to its final left-side position before the muzzle clears the holster.
[img]20150203_083220 by OrigamiAK, on Flickr[/img]
[img]20150203_082900 by OrigamiAK, on Flickr[/img]
[img]20150203_082839 by OrigamiAK, on Flickr[/img]
I think it has the two sounds you are describing too. The sound when I am getting master grip does indeed come from the force exerted, though my self-perception is that the direction is more out-then-in rather than up-then-down. There is a little bit of downward direction to it, but I think it mostly goes inward. It's pretty forceful. Sometimes I get little cracks on my index finger from it hitting and edge of the belt loop. Small price to pay though.
Gun path to target has changed for me over time as I started with a pretty conventional rising path from sternum area to eye-target line only at full extension, but moved to variations of the press-out, with more of an attempt to get the gun into the eye-target line earlier, and at this point back to a more conventional rising path from sternum area to eye-target line only at full extension. I think that path is pretty clear in AsianJedi's video from class a week ago. Many of the draws from the '51 Match Draws' video I posted are from a few years ago and you can see the press-out with the higher path in some of them.