I don't know much about plants - I tend to use the "grow or you're out" method for caring for them. But one tip I have found for Christmas cactus is, during the month of September, add a tablespoon or two of castor oil to the water you give to your cactus. Then water with this concoction as often as you normally would. Apparently the oil will help the roots to grow and by Christmas your plant will bloom better.
To be honest, I'm not sure about the flowering, but I have noticed that my plant does grow bigger. If you try this on your plant, let me know what results you get.