I have been using Dunlop Black Widow 17g mains/Gosen Micro 17g cross for a few months now and enjoy the initial playability of this string. It is the most comfortable and spin friendly poly string I have tried to date. But the issue I am having with this string is tension maintenance problems. (I use racquettune to gauge tension) But after 4-6 hours of playing (2 matches) it is no longer playable and loses up to 10lbs in tension! (52 lbs initial tension to 42 lbs!) Is anyone else having issues with tension maintenance with Black Widow 17g?