I'll throw in some advice from Jimmy Reid. I cannot quote it word-for-word, but it goes like this:
"When I walk into a pool room and I see two people playing and I know nothing about either of them, I always put my money on the person not jumping up after the shots."
That says a lot coming from Jimmy.
For me, I just made a conscious effort to stay down. As you begin this, you will once in a while foul when the cue ball draws back, or another ball comes back to your bridge. Once you start actually fouling, you know you are staying down long enough. Obviously, you have to be aware of it, and avoid it once it starts happening, but if you have NEVER fouled from a ball hitting your bridge, you are absolutely jumping up too fast.
Also, keeping your eyes on the object ball contact point is exactly where I keep mine. Plus it looks super-cool when you are looking at that point in front of you, meanwhile the balls have banked or thin cut totally out of your view, but you KNOW the result- the balls are GOING DOWN and you don't need to move a muscle until you hear it drop. Trust me when I say those six pockets are not going to move. They will still be there, in the same place, after you finish the shot.
So much time is spent on the other mechanics of the shot, but too little is spent on this (comparably) simple part of the shot; yet it is SO important...