Just to be sure, are you sure you're doing the right difficulty? Some gem cases are only available from certain difficulties for stoodie's experiment.
The ASPD Gem Case isn't a % increase though it's a flat +100 Also I have a mostly complete spreadsheet but the site won't let me post the link...
Hey, I'm DJVoxel. People tend to call me DJ, Voxel or Vox. I don't mind either way, so pick the one that you like best. I've been playing the game...