A/B Testing Feature - Distribute volume evenly among variants upon adding a new variant

Would prefer an A/B Testing feature where we can simply add a new variant to our already existing campaign and the platform will evenly distribute from the volume among the variants from the start date when a new variant is added or activated.

It takes a while for our B variant to catch-up to the volume that our A variant has already sent out over weeks/months. The current set-up doesn’t allow us to be fully flexible when it comes to testing out our email copy. If we have to wait for 4-8weeks for our B variant to catch up to the A-variant volume, then it’s just very inefficient.