I think Nickel Roundwounds work best on these basses. L2000's are already hot & bright, and stainless strings will just add more hotness and more brightness. Not good.
I've found Curt Mangan strings to be the perfect balance of tension and subdued midrange that these basses need. A mid heavy string like Dunlops or DR Sunbeams to me do not sound right because they add more midrange to an already midrange heavy bass. I love DR and Dunlop on other basses though
