I'm trying Babolat natural gut for the hell of it and was wondering how gut normally compares to other strings tension wise. The k90 has a range of 50-60lbs. I'm normally a polyester user (Kirshbaum Pro Line II) and string it at 54lbs. What would the equivalent in gut be? Basically, I'm trying to make sure I don't waste my rare gut stringing by screwing up the tension. Any help appreciated.