FBA How to Change ship from address on shipping plan without having to start all over!?

I had my FF address on the last shipment plan. I wanted to shop around my newest large shipment to get quotes for a better shipping price from freight forwarders. Now with these RIDICULOUS demands from Amazon, I have EIGHT warehouses I need to deliver my goods to. Its EXPENSIVE - I need to find a good price.

I found a new FF and I should revise and use her address. It seems if I want to change the ship from address, I have to START ALL OVER. I already shopped around the 8 warehouses that are on the current shipping plan! If I start all over with a new ship from address, I don't know if I'll get the same 8 warehouses and the same plan.

WHY can't amazon just let us edit a ship from address without having us START ALL OVER!!!??? Wouldn't that be easier on their system vs. starting a new workflow??

I've tried switching browsers and that doesn't work. Any other ideas?