Sorry but it sounds ridiculous to change the tension on your cross strings because you think it's the causing the frame size to distort slightly. You dont think Yonex is aware that people string main and cross strings at different tensions? Even if that is the cause, why would 3mm matter? The feel of the stringbed should be your primary concern and raising the cross strings tension might adversely affect how it plays.
@Nate7-5 , not sure if your post was directed to me or
@Syfo-Dias , but since I was the one who initially mentioned about changing my cross string tension because of the distortion, I thought I would clarify since you said it "sounds ridiculous". "Ridiculous" is defined as "deserving or inviting derision or mockery; absurd" I really dislike when posters use inflammatory language on message boards like this, so I'm going to provide full background detail on the cross string tension comment so that others can more readily determine if this falls into the realm of absurb that you imply.
First off, I don't "think" it's distorting the frame length, I know it is. Three different stringings by me, and I've had others confirm the same experience when using lower tension crosses versus mains for this frame. It's a soft frame, so this is not unexpected and within reasonable tolerance levels for a frame I suspect.
Secondly, I think Yonex makes a lot of different frames at various stiffness ratings, and they provide a range of suitable tensions and probably aren't going to get more detailed than that. Obviously, a 3 mm distortion is
not a big deal, but to me it is an indication that the frame is not in an ideal equilibrium in regards to the mains and cross string tensions. Stringway has a nice tool that provides recommended main and cross string tension, and it's calculations recommend the crosses at about a +2.5 lb margin for this frame's shape as well. Not sure the "science" behind it (if any), but this was part of my rationale for wanting to increase the cross tension.
Thirdly, feel of the string bed is certainly a major concern, but feel has to be balanced with playability. In my case, the poly cross strings drop a lot more tension versus the gut mains and over time this large tension differential results in the string bed getting a little launch like for me. Thus, raising the cross string tension a few more pounds above the mains should help with this, so it's not just about the frame distortion. Furthermore, this is a new frame for me, so I'm still in the process of finding my preferred tension set up. I have used higher cross string tension versus mains quite often in other frames, so this isn't some random experiment for me. I'm familiar with the effect and feel it typically has, but I have not tried this setup on this frame yet to see how I like it. Thus, I may like the feel better than the other setups, but there's no way for me to know without trying it out. Besides, increasing the crosses from 48 lbs to 52 pounds is still within an acceptable range for me where the poly still feels fairly responsive and soft (as far as polys go), so the impact on overall feel should be very minor.
Lastly, I understand the point I think you were trying to make, and it's very valid. People should not be changing their string setups if it is providing them the feel they are wanting (barring some other issue like it causing tennis elbow). In my case, I have my own stringing machine, so it seems I'm always tinkering with things and I enjoy it, as ridiculous as it may seem.