Yeah ... good idea, too.
Read an article last night that said to reprogram your thinking of hop pellets to be 'air-sponges' and it'll improve the longevity of your beer.
Blowing off the head-space doesn't begin to cut it, especially if you don't have active yeast in suspension ...
So, that extra 2oz package I added for a 2nd round ... to clear, month+ old beer ... uhm, yeah, no bueno, LOL ...