Most "all" crossbows are built that way to some extent or another.
The only modern bow I've seen that doesn't have a fair amount of string pressure on the rail / track is the Darton lineup. Their strings just barely touch the track.
Not too much you can "easilly" do except keep the serving/track waxed.
OR...if you have access to a mill...you can take the bow apart...put the track in the mill and remove a little material...maybe .090". Then reround the corners where the string rubs.
Might try using a tuffer serving material also.
Keep it waxed..
Mike