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It's a lot flatter if you go further south.
I've ridden some of the same roads you're on but during Transiberica where I'm picking roads for speed, not niceness. Can't really comment on any of that other than Spain is much nicer to ride in than UK so you don't need to be as wary about finding yourself on bigger roads - they often have big shoulders and the drivers aren't pricks like here.
Pulled together a route for the Biarritz to Barcelona trip.
It's longer and has much more climbing than I'd like, but it hopefully avoids death-tunnels and motorways.
If anyone wants to cast a critical eye over it to check if I've made any major errors, that would be fantastic!
B2B Option 1