My arm has always be sensitive to stiff strings but I can help it. I hit with a Pro Supex Nano Energy Here is my problem, I love hybrids, I think they are the best thing to ever hit tennis, currently I use big ace 17 and spiral flex 16 (56lbs) and I love it but after 3 months of everyday tennis it is starting to take a toll on my arm I think. Here is the other problem, I hate synthetic gut for some reason (possibly in the head) but I feel like I just cant get the same topspin out of them which makes since as you are going to get more topspin out of a poly. Now I am not one of these people you see with a full western grip swinging like Andreev but I hit with a fair amount of topspin. Is there a set up with synthetic that would get me the same amount of topspin? Maybe a thin synthetic at a ober high tension?