Hi @ethilo,
Yes - we recommend that you do these without ERG mode so that you appropriately hit the target you are capable of. With Zone 6 you have a range there and on ERG mode it picks the center. By switching off ERG mode you can let your mind dictate the pace or power that is within you. Woul recommend you consider joining us on Thursday mornings on Velocity with @Marjaana and me if it ever fits with your schedule where we do this session and teach the nuances of proper 30/30 HIIT sessions. Correct on your assumptions I would guess also for why the lower assigned load.