"CBD is legal."
And still a schedule one controlled substance.
"regulatory overreach and punitive zeal."
I have to respectfully disagree with you.  If it is within the scope of the law and there is a rational basis for enforcing the law then it is a valid regulatory exercise.  It is within the scope of the law:
"oil fell under the state regulation definition of marijuana. Stores selling the products that hadn't gone through the state's testing and packaging requirements were violating state law"
Unless you have evidence that the board is somehow prejudiced or specific acts that demonstrate spite other than enforcing the law against the effected store owners?