Seller fulfilled Prime & Premium Delivery – both needed?

We are facing an issue where when we switch off SFP on our account settings at 2pm – We then get premium delivery on these products placed between 2pm & 4pm and needs dispatching by 4pm. (Our SFP carrier arrives at 3.30pm and was told by amazon shipping to switch off beforehand so theres time to pick and pack.)

Is the only way to avoid defected orders, to change the templates on all the sfp skus to one where premium delivery isn’t mandatory? Our seller fulfilled prime template has mandatory premium delivery (regalrless whether SFP is active)

Is there a way we can switch off premium delivery from our SFP account? years ago these were separate and can no longer find a switch to turn off premium delivery