If your chlorine consumption is still higher now than it was before your pool went green, then keep the shock level up until the consumption slows down. Usually if you have a CC of zero and the water has become clear, you're safe, but it won't hurt to keep it up another day.

As far as pH goes, it won't come down after the shock level drops, unless you've gotten false high readings due to the elevated chlorine levels. In any case, 4 oz shouldn't hurt anything.

Janet