I used 10 vials on Ningendo and finished his BT/Trial with 180 fragments I had stored, meanwhile on Gakido I used 60+ vials and only things I've gotten are Mystery +2 and +1 chase...

No idea if I'm just unlucky or it's lower chance to get Gakido's trial/bt. I remember getting Sasuke's and Tsunade's fairly quickly as well.