I string my own rackets on a Gamma X2. I've done about 50 rackets and thought I was doing a fairly accurate job. I've downloaded the Rackettune app and it turns out that my reference tension is always much higher than the RT reading. For instance, I recently strung up a guy/poly hyrbid. Mains were at 54, crosses 48. Rackettune registers 46 lbs for tension. I've had similar issues with full poly jobs. Put machine on 52, rackettune registers 46. The difference can be as much as 8 pounds lower than I intended. Now, I believe this is entirely my stringing error, not a rackettune issue. I cleaned my clamps and worked more slowly, even doing the JET method where you string one cross ahead while the prior cross is under tension, in order to (I thought) minimize tension loss. No luck, same results. So here is my dilemma. With the last gut/poly hybrid I strung it came out about 8 pounds lower than the intended 54/48 hybird and I feel the strings are too loose and somewhat lacking in control. A gut/poly hybrid in a 6.1 16x 18 that registers at 46 lbs is a bit of a rocket launcher. Since my stringing seems consistently lower than intended, I figure I can use rackettune as a reference guide. I can keep increasing tension until I get the reading to come in somewhere between 53-55 pounds. Which string should I increase? Ie, how can I figure out where the problem lies? If I am messing up crosses, obviously I shouldn't be increasing the mains by 8 pounds. I was thinking of trying a hybrid at 60M/50 crosses, thinking that increasing the gut mains will not alter the feel as much as a drastic increase in poly crosses. Any thoughts or suggestions? Are there common errors for beginners that result in tension loss that I need to be more aware of? Thanks.