Aren't feeding schedules a pain?! About 2 years ago we went through the same thing you are going through. Fluffy was the hardest one, and still to this day 1/2 hour before their lunch or dinner time he will come and find me and whine for the next 1/2 hour untill its time I think he has a "feed-clock" inside of him!! lol

Just remember, YOU are the boss and stick to your plan. They will all eventually come around to getting use to the new ways!!

Have fun!!