Hi Kristin,
You may already be aware, but the modified barium swallows are done with the Radiologist and a Speech Pathologist giving the patient various types of foods like pudding, breads, thin liquids, etc. that has a small amount of the barium in it. They both watch during fluoro and make a "movie" while the patient swallows. The main thing they watch for is aspiration and which thickness was the safest for the patient. They can also see which thickness is not clearing epiglotis area properly. I'm not a doctor but I help one everyday LOL . This might help you in deciding to consider the peg tube.
I will keep you both in my prayers.