He's eating bubbles? That's a bit odd.
Well, since he's gone and made himself bloated, that does throw a monkey wrench in things. For now, go ahead and keep him in the current dosage of AQ salts, that's fine. To get him to deflate, we need to get the air out of him. Hopefully, he can get it out himself - if he stops eating bubbles, eventually the excess air will dissipate and he should deflate.
Do you have any idea why he would be eating bubbles? And where the bubbles would be coming from?
EDIT: You can also switch him to epsom salts as Amph recommended, either one will work. Because his bloating is not caused by fluid buildup, AQ salts won't hurt him.