Why Yonex Recommend 5% Less Tension on Crosses?

[gmlasam]

I went to the Yonex site to find some info on why Yonex racquets should have the cross strings tensioned 5% lower with the main strings and there was non. Where did this recommendation come from and why it is recommended?

I've always strung my RD-7, and Super RD Tour 90 between 56-60 lbs with one piece stringing using ATW. Is one piece not good for Yonex?

[mido]

Many pros are using 2-3 lbs less tension on crosses.
See Hybrid stringing section on TW website for explanation.

[PurePrestige]

Something to do with the more squarish head shape of Yonex frame's. I think it causes some form of disparity on the tension of strings in terms of mains vs. crosses. As most frames are more circular, Yonex frames have more uniformity of string length because of their design?