How can I alternate full and incremental backups?

Currently I have a policy where I run a full backup three days a week and an incremental four days a week (the days are hardcoded in the schedules).

I tried setting up a test policy with the full backup to run every 2 days at 10 am.  And then I also defined a incremental schedule to run every 2 days at 10 am.   When the policy ran for the first time (yesterday) it ran the full backup (as expected).

I hoped to see that the incremental schedule would have then run today but it didnt.

Anyone have any ideas on how to alternate full and incrementals every other day?