Hello @LukeStephan,
Thanks for writing to us.
Regretfully there is no option to stop the dynamic classes since the Cornerstone builder generates a unique class for each element so that your styling that you do through the Cornerstone builder can be saved and renders uniquely based on the unique classes. Once you have saved the Cornerstone builder settings and styling it doesn’t generate a new class for that specific element till you delete it. In case if you delete and re-add the same element, the Cornerstone builder would generate a unique class for it.
I would suggest you finish all the page settings and Cornerstone builder settings and styling the implement caching to get a great result.
Hope it helps
Thanks