If your hose is too long too much resistance from the hose will likely reduce the flow rate. You can use the link above to input your data and see what length of beverage line will make for a good pour with the amount of carbonation you apply to your kegged beer, the temperature it's at, and the...
Iv'e had overcarbed kegged brews meant for a wedding of a friend and I was really worried, this technique worked fantastically! Thanks!
Collin did you also consider your beverage tubing length (resistance) and the serving pressure at which you attempted to pour?
Hope this might be useful...