You do seem to have planned some long days bearing in mind the time you have and, as has already been mentioned, the stretches below Stracey Arms and St Olaves will not be the most scenic! We usually suggest people ‘go with the flow’ for a few days, there will be plenty to see and pubs to visit in the north. Still, whatever you do decide, I hope you have a very enjoyable trip.
And, no, I don’t think a rented motor home in GY really cuts the mustard!