Hi Rod,
My wife & I walking in 2009, and probably started planning as far out as you have. We found the planning & anticipation a wonderful part of the whole Camino.
We walked from SJPP but had plenty of time, so didn't have the problem that you face.
Burgos - Leon as you know incorporates the Meseta, which sometimes gets a bad wrap, but my wife and I enjoyed it, although it can (IMHO) appear a little repetitious compared to other sections.
However, one of the things we discovered was that you just don't know what the "stages" are going to throw your way. We had some good experiences on the way across the Mesteta.
I remember commenting to my wife during our walk, that if I didn't have time to complete the complete CF route, then I would start from Leon.
The other alternative is to walk the complete route over a couple trips. Many of the Europeans do this, but of course it's a bit more of a committment for people in Oz to fly to the other side of the world.
Any how, good luck with your planning & decision making.
Buen Camino
Col