I've recently noticed my listings are showing a 2 or 3 day window for delivery on my seller fulfilled listings. They used to be next day, which helped me get the buy box.

I've started using Royal Mail 24 hour service which is a next day service, but delivery to Scottish addresses often take a day longer. which has really impacted my OTDR and dropped it down to about 90%.

I tried asking Seller Support for advice on how to remedy this but got the usual 'cut and paste' type response that the OTDR percentage reflects my performance - after being on hold for 40 minutes.

But I need to know what's the best way to workaround this from the following options,

Automated: Use Shipping Settings Automation (SSA) for precise calculations - will this actually help improve my OTDR?

Manual: Customize transit times by region (Scotland) through shipping templates - is this easy to do - and will this actually help improve my OTDR?

OR - Do I manually set my delivery times to 2 days now so that my OTDR picks up? - This would improve my OTDR, but would I still be losing the buy box because of it?

If any of the AMZ admins are on hand to offer some advice it would be much appreciated @Spencer_Amazon - is this your field?

@Julia_Amazon @Ezra_Amazon @Maja_Amazon@Winston_Amazon @Ash_Amazon @Sakura_Amazon_ @Abella_Amazon @Ange_Amazon @JiAlex_Amazon