I wouldn't be too concerned about having to go for a fill once a month. Everyone is different with the fill amount required to get to the 'sweet spot'. I reviewed your post that notes the fills you have already had done and I would think you would be getting close to that 'spot.' I don't think a surgeon would continue to fill a band every month for months on end. There is a limit recommended by the lap band manufacturer on maximum fill amount (# of cc's) for your band.
Banded : 3/15/07
Fill: 3 fills, 4CC's in band