I have been stringing my racket. The strings don't seem to feel as good , or play as well. For sure, they are definetly looser even though I am stringing at the same tension as when I used to get them strung at my local club. Same strings, too. What could I be doing wrong? I try to prevent friction burn. I have a gamma x-2 stringing machine. Does the machine matter ? Does a better machine produce a better stringjob?