why do my strings move so much

[plaxx42]

I just strung my hurricane tour 17g / xcel 16g with my ksix one 95 18x20
@ 58lbs/56lbs

and I played for like 4 hours and the strings are already moving especially the xcel...

[Terr]

The Xcel will move around because it's a multi. I have a racquet with the bed strung with Xcel Premium 16 and the strings move around like crazy.

PHT starts to move around after about 3-4 hours of play for me. Poly naturally loses a lot of tension very quickly. I think most poly users find this happens. I get the feeling PHT has more of a problem in this area than some other polys.

I tie a rubber band around the middle two mains, like a dampener. That helps increase the tension on those two strings a little bit. But eventually it will just start to feel really loose.

Perhaps a new poly would be better?

P.S I use PHT 18, the whole stringbed on my Babolat Drive Z Lite.