Don't consider the Camino in stages. You know your start and finishing points. Walk from one to the other. Make a list of the places you don't want to stay at, and... well... don't stay at them.
The
Camino Frances is essentially a long route with places to stay dotted along it. Stop where you want. If you get a guide that is not divided up into daily stages you won't know any better anyway.
The Outdoor Guide by Raimund Joos for example lists places on the route you can stop, without defined stages. So when I was looking at my next day's walk I might consider distance or how the village/town 'sounded', my judgement was not clouded by wanting/not wanting to stop at the end of a 'stage'.
If you want to stay in Pamplona, Logroño, Burgos or Leon (maybe they are stage points?) it could be best to avoid Saturday's (and to a lesser extent, Friday's), accommodation is harder to find and therefore prices are higher.
For all I know some of the places that are stage ends could be amongst the best places to stay, to go out of your way to avoid them may not be the best plan. Say for example you looked at a rough distance for your days walk. It may put you at the end of a popular stage. What do you do? Walk less than you want? Walk more than you want? Or walk the distance you are happiest with?