First off I'd state that I highly agree with the earlier posters; light your set for the effect you want and your actors should fit right into it. However, I see that you're working with a limited kit and have a recommendation on what you're looking for: Block out your long run with your actor, and decide on a few marks based on his pacing, or your or the director's desire. Tape out those marks, and light your subject on those marks to a consistent contrast ratio, by using your incident meter to determine the ratio between your fill light vs keylight+fill. From the tone of the shot I'd say you're looking for a 1:8 or even a 1:16 ratio. If you want to get some great info on contrast ratio lighting check out the book 'Practical Cinematography' by Paul Wheeler, if you can find it.
