Recently played with a Fischer Pro No 1 with new strings, about 46 pounds mains with Lux XP 16L, and Pacific multi 16L for the crosses at around 44 pounds. This is very low as I usually play with rackets around 58-60 pounds tension. The racket feels like a trampoline and strangely there is a lot of vibration felt because of this trampolining effect. (I did not seem to notice this when I used the same racket strung at a higher tension with synthetic gut). I'm starting to feel pain in the elbow and shoulder, though I have to say that my play has not been compromised by this loose tension. I've always thought that too high a tension can cause tennis elbow; now it seems that the "vibration" and the "trampoline" effect of this loose tension may also be the cause of elbow problems. Or it it the racket? I've never used a Fischer before and it could be that the frame is too stiff. Hope some one can help, thanks!