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What you have set up now means that all leads in the email program receive one of the nine variants, however no one will receive the winning email once that is determined (ex. most clicks). Per design, if you change the test sample size to 33%, that fraction will receive the variants and then once a winning email is determined, the other 66% will only get the winning variant.
Since you want all variants to be sent evenly. I would instead just use a smart campaign and set the flow of send email: random sample (% of whatever 1/9 is) and select all nine variants for a total of nine choice conditions. Since you will not be sending the winning email anyway and just want each email to be sent evenly. You can then create an email performance report that compares those nine emails together.
1 of 1 people found this helpful
Seconding Devraj's answer here! The setup above will send 100% of your audience your champion email, and none will receive the challenger. I also would do a random sample split, 11% for 8 of the groups, and the final group will be 12%.
Thanks, Devraj! This is the route I took in setting this up.