DPS (AKA Damage Per Second) isn't something that you just magically get as a paladin. You have to work for it, gear for it, and enchant for it. You have to know your rotation - and what FCFS means for you - know your place in the raid/heroics group, and know your seals/blessings/auras as well as who needs what when.
Topping damage charts isn't easy. Fortunately, there's a site that makes it much simpler.
http://www.retpaladin.com/
Learn it. Live it. Love it.