Hi Hasher! Welcome to the forum!
I think the question is Why did you choose Sevilla to Salamanca (and not any other stretch)? Surely, you'll have your reasons and they might provide tips about what you may like to miss in between... That's assuming you want to miss something as you suggest with your question(s) because, maybe, you could think once again if you wouldn't prefer to walk a shortern stretch withtout missing anything in between.
IMHO, your preferences, aim, interests and some other personal factors are the key to decide what route and/or stages to walk.