Luxilon Big Banger Alu Power 16L Tennis String Set

When i first put this string on my racquet it was wonderful. I felt powerful and in control on the court. But recently I felt out of control and my arm was getting sore. I have been playing a lot though, so it could be that the strings were losing their resiliency (or fatigue on my part?). Anyway, it looks like these strings will last a good 20 hours of play (3-4 weeks) for me and they will not break. I'm going to try the Big Banger Ace too for comparison.