Hi Trailhawk,
good to see that your plans are still holding firm and that you are now going for April next year.
Also interesting to see that you are planning to make the cross-over to the Primitivo at Villaviciosa. I found both Norte and Primitivo options to be good, but the higher, remoter pasture lands of the Primitivo are quite special. You just have to be patient as the first part to Oviedo (about 45km) is the least interesting part, passing through dormitory towns and suburbs.
I just wanted to mention one special place on the Primitivo, which I hope is still there, as it is now ten years since I walked this route. It is at Grandas de Salime, which is about halfway along the Primitivo
https://www.gronze.com/etapa/berducedo/grandas-salime
Here they have an Ethnographic Museum
http://www.museodegrandas.com which shows the elementary tools and methods of the local people going back thousands of years. Looking at your blog it occurred to me that it might interest you to see the kinds of methods that evolved from the original bushcraft of the area. When we walked through, we met the founder of the museum, Pepe el Ferriero who was working in a forge right at the entrance to the town, shaping metal wares. I'm not sure if he still does that - or indeed is still alive - but worth looking out for.
Cheers, tom