"Best" is subjective, but if you want to listen to them as PWK voiced them, an update to the E network would be appropriate.
I'd update the caps on the C and take a listen. Order an extra pair of 1uf or 2uf caps at the same time to update to an E if you don't like the C. With the k22k swap, the bass will be more pronounced vs an E. Not necessarily a bad thing...