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This really only studied "If I only have 20 ml of liquid in a GI cocktail, should it all be antacid, or should half the volume be lidocaine," and the answer appears to be all antacid.
To answer the question I'm interested in, they should compare some amount of antacid vs. that same volume of antacid PLUS some amount of lidocaine, which is how most GI cocktails are made in the facilities I've worked in. Reducing the amount of antacid in order to keep the volume the same doesn't make sense to me.
What you do matters.