I have 2 RQIS 1 Tour XLs that I love. In my opinion, the best racquet ever made, for me. Perfect balance, weight and stiffness level. I realize that they won't last forever (....and I bought them used.) I also own 2 RQIS 1 Tours that I bought impulsively when they were on sale before I got the XLs. The problem I had with the 1 Tours (red/black) is that they were a smidge low-powered and not stiff enough to the extent that I had to swing harder (and thus, lose control) to create the level of pace I would get a little more easily than with the XLs. The two racquets are pretty identical in weight and balance (the XLs being, predictably, 1 or 2 points less headlight and a few tenths of an ounce lighter.) Fun to play with, but not something I want to go to battle with just yet. My question is, is there a way of using strings (whether that be higher/lower tension or a different altogether) to change the feel of the 1 Tours to match the feel of the XLs? Or is lead tape the best solution. Or more generally, does a stiffer string/tension on a flexier racquet make the RACQUET stiffer (feel-wise), all things equal, or are string stiffness and beam stiffness two completely different things? Hope I am being clear enough here.