Bounce is when the meat keeps cooking after you've removed it. Bounce is more pronounced with higher cook temps. I feel adding a few spoons of liquid, either drippings or juice or cola, helps.
If your brisket is just about perfect, you want to let it cool a bit before foiling to bleed off excess temps.
I used to do briskets at 225~250 at the grate but now use 250~275 and I like results better, not perfected yet, but better. But I don't foil during the cook.