I purchased two dozen Wilson Titanium tennis balls. I've used these balls in the past and was more than impressed with how consistently they bounced. However, recently my view on them has changed drastically. Maybe it's just me and two of my friends, but I can not for the life of me put much top spin on these balls no matter how hard and exteme i hit. Seriously, i feel like i'm walking on broken glass when using WTi balls! These balls have ended my month long streak of not losing a set for over 30 days. Has anyone else experienced the same problem?