Leather strop and paste - the blade tang, the washers, and the liners all can be polished to the point of smoother-than-glass and it makes a huge difference.
Plus, you don't have to worry about removing too much material (careful not to bend the washers and stay clear of the ball-detent).
Then I lube everything with Lucas High Performance Assembly Lube.
^^ i do the exact same, but use tuff glide!