With the introduction of boosts your class-system got redundant.
What’s the meaning of a cunning creature, when you have the possibility to outspeed them with the other classes?
Since the introduction of boosts players created a new class, the Nitro-Chompers with creatures like 145 speeded Thors. Now with the shuffle they swapped to Morty, which can even reach a speed of 148.
I know most of the players follow the idea “If you can’t beat them, join them”, but I don’t want to.
Fierce creatures were originally designed to be slower but therefore a high dmg output.
With the introduction of speedboosts this was thrown away.
So my suggestion to you is to introduce a sublimits for each class on HP-boosts/Att-boosts/Sp-boosts.
Only cunning creatures can boost speed to the max.
Only fierce creatures can boost attack to the max.
Only resilient creatures can boost health to the max.