Ok I was playing with my rqis when I noticed my polys go dead on serve. At the 2nd set I went to my spare tfight 325 and noticed I had a lot less frames on my groundstrokes. It seems that the tapered 25mm hoop of the yonex does affect me hitting with topspin. I use a ww forehand and 2 hand backhand and rely a lot on topspin. Thick beams give you a smaller window for topspin shots, even tw has data on this. So what are the advantages of thick beams? Is it stability on touch shots? I still had to add lead at the 3 and 9 on the rqis to make it stable to hit drop shots without twisting. And I'm pretty sure it doesn't affect power potential coz that's entirely on the mass of the hoop and thicker beams are usually hollow and lighter.