If your heavenly key only boosted you to 80%, i'd have to show a thing that may be the case.
Have you used Dotjeiess, spirit of creation? If you slot that in the Pantheon, it clearly says on the slot and when not used that you'll have the effect of these: "Buildings are x% cheaper and heavenly chips have x% less effect".
It may be the effect of heavenly chips having less effect from Dotjeiess, unslot Dotjeiess if you have used him in the Ruby slot and you'll see your heavenly key boost you to 100% instead of what is shown here, 80%.
Hope this info may help you out.
What's a Heavenly Key? I bet it's something from Ascending -_- | & I haven't Ascended because...I don't wanna Lose MA COOKIES!!!!! :(((((((((((((((((((((((((((((( oh man
just no