which roval wheels did you get? the roval wheels come with one of two different free hub bodies, one, made by DT swiss, using their star ratchet design, and the other, i think is made my KT, or possibly alex that uses multiple pawls with light action springs, packed in light grease.
i have the fusee star wheels, which use the non-DT free hub it has loosened up over time. some of the grease spun out and there is now less resistance. if you got some of the new fusee SL wheels, they use a DT swiss free hub body, which will almost always have a little resistance, but the engagement is superb. it is possible to open it up and lube it with a mixture of tri-flow and a thicker lube, like phil wood tenacious oil. this will make is slightly less noisy, and it should spin very freely.