[whpalmer4]

It sounds like you want a sequential action group, with the action group set to complete automatically when the last action is completed, and to repeat on completion.

Make a parent action to hold the repeating tasks. Indent the repeating tasks under it to create an action group. Select the parent task and bring up the inspector. Set the parent to start again 1 minute after completion, and to automatically complete when the last contained action is complete. Do NOT set any of the actions to complete — you want OmniFocus to create a new clump of actions. Also make sure in the inspector that the parent is set to sequential execution (2 slanted arrows). Try it out and see if it does what you want.