I have a roll of LaserFibre Classic Syn Gut that I'm using to experiment with different tensions. For the heck of it, I tried prestretching one string job prior to stringing. I then strung the prestretched string at a tension that should have yielded a lively ball response. Instead of a lively string bed, the strings played absolutely dead with no power at all. The only thing I can think of that caused this was the prestretching of the strings. Is that the likely cause? What else can cause a string job to play dead with no power ?