A Plan For Heroic Tokens

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So Heroic Tokens current have 12 2* characters. 11 of them have a 7.2% chance of being pulled. Lets take some of those percentage points. What if the chance was lowered to 6.2%?

That would give us 11% to play with.

6.2% - 1000 ISO
3% - 2500 ISO
.7% - 5000 ISO
.7% - 50 HP
.2% - 10000 ISO
.2% - 500 HP

These are just arbitrary figures that would have to be tweaked as to not be game breaking or insignificant. I am not good at game balance calculations so I will open the floor to discussion. I just REALLY want the HP and ISO rewards to stick around.

Also, I realize that some of these numbers are way off from what is in the Anniversary token, but I figured that the high prizes were special and couldn't be sustained long term. Am I wrong?