In chelek aleph #338, the Rivevos is mattir (note that he cites R' Sroya Deblitzky as being mattir as well). In chelek vav #259 he brings down that Reb Moshe assers, but the Rivevos sticks to his guns and continues to be mattir. In a safek of a minhag that is not even a d'Rabbanan me'dina d'Gemara, it seems reasonable to be maykil.
http://divreichaim.blogspot.com/2010/04/haircuts-this-friday.html
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