Maybe consider an alternative more easy to understand for regular users.

We have the redfish/minnow/dolphin/orca/whale scale.

Just do something like this:

• Redfish: n
• Minnow: n x 1.025
• Dolphin: n x 1.05
• Orca: n x 1.075
• Whale: n x 1.1

You could easily turn this into a curve,

vs

, where V denotes the accounts vesting power, but that would defeat the purpose of being easy to communicate. You could just sell it as 2.5% fish size bonuses and everyone will understand.