KYOSHO Sukhoi Su-31 40

Judging from the original aspect ratio, I come to a conclusion that the scale should be changed a bit to obtain more vertical pitching stability, so the position of the stabilizer would be set at 60mm posteriorly. The original shape would be spoiled but actual performance would be far improved compared with the original design of this model. Any way, the result would be reported soon, as the most free time of these long vocation this year would be spent for the preparation of Sukhoi Su-31. 60mm extension of tail moment arm would take effect for stable vertical maneuver actions?