Each time you level one of these up to max without using the Evolve options, you can use the Reshape option. That'll give it +3 max level. If I were to reshape this one 5 times, it's max level would be 20. Then I can use the fusion menu on the farm to give that max level to another character.
I feel so dumb for not thinking of that. Thanks for the detailed walkthrough there, really helped me.