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You might want to consider doing the Primitivo from Oviedo as that can be done in the time you have and saving the Norte for another time as it deserves the full walk.
Good sound advice from Antonius - I have done both and stayed on the Norte and then came back to do the Primitivo. If you are not coming back then go the Primitivo route as it is more beautiful.
You can overthink these things and reading guide books warning of severe climbs can make you overly fearful - the hills won't move so you just have to go over them. I walked the Norte in 2016 and the Primitivo in 2017 and found both okay - your body will adapt and you will be racing up them by...
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