Plus X times always worked perfectly for me with VP120 and Rodinal is a really fine developer for VP because VP tended to be a bit mushy in the high tones. It benefited greatly from the nice separation given by Rodinal.
In my opinion, VP Pan was one of the best kept secrets in medium format films. Very forgiving, long-scale film, oft maligned as an "amateur" film.
John, Mount Vernon, VA USA