try less light, maybe remove/reduce the white for a few days/weeks and see what happen. mine are puffy all the time, they are are not directly under the lights.
Acanholic, can you please provide a full tank shot. I would like to take a look at where they are placed in your tank and how the water is flowing. Both these factors play into the puffyness. Also I see that you are feeding heavy so it would be worth while to see what your po4 and nitrate are at.