I actually had problems with Phil's slipping because of my chrome dropouts. I kept stripping the heads from torquing down as hard as I could. They told me they had a new product called "chrome domes" which would solve my problem which they sent.
These suckers create a much larger grabbing surface than any other hub out there. They act as a large washer which distributes the tension evenly. Call Phil's up and upgrade if you have any sort of slippage with the Phils.