I revised from a Realize Band (June 2009) to a VSG after severe reflux and the discovery of a pretty bad band slip.
As far as IF goes -- with the band, I could not eat very much at 1 sitting if I really ate protein first --- so, going for 20 hours after only 3 ounces of chicken or beef or fish would make me very hungry -- and cranky and slow my metabolism.
Have you tried really going back to the beginning with your eating -- pea-sized bites, 3 oz of protein with a little veg until satisfied --- 3 times a day (finish eating by 6 pm and fast until 8 am -- get a little IF in there) -- no drinking with meals, etc.? A reset like that might push the scale and keep you satisfied throughout the day.