Hi,
I was also banded on 4-12-11. I have lost 16 lbs so far from starting my pre-op diet. Don't worry, you sound like you are doing it correctly. I have been having yogurt and pudding and it is working. I was in the hospital for 3 days due to low potassuim, so I was loaded with liquid.
I have been having a yogurt everyday and have been losing. I have make up my own sort of yogurt conconction that is working great. Here is is in case you want to try it:
Half of a dannon light and fit pinapple/coconut yogurt (3 ounces)
about 2-3 ounces of 1% milk or skim
scoop of vanilla Protein powder
few ice cubes
Blend it up and it tastes like a virgin pina colada and loaded with the protein! Takes a little time to finish it all, but you should only sip it.
I have also added Protein Powder to any instant sugar free pudding (usually a half a scoop)