User blog comment:Vina T/GE2: Rage Burst Translations/@comment-175.142.152.23-20150512075243/@comment-26066218-20150516121015

支援効果発動+1 combined with  遺された神機レア↑ and  遺された神機入手増 or you can have 2 acquisition increase to obtain more skill installs for support skills, It may increase your chances but it really depends on luck. Sorry for not being too helpful.