We made you a tool in the UI! Go to optimize, testing results and you’ll see it. It’s a slider to control new vs old testing traffic percentage.
It’s there to report on how the old site will do against the new page layout experiments and allow you to control how much of the traffic goes to the old site style and how much goes to the Ezoic recommendations. If you pull the slider down to a lower number, this will reduce the pool of users who see the old site and boost your income.