I cycled the parts of stage 17 and stage 18 which I mapped with my touring bike. It was steep in parts but all cycleable. But this stages where not signed for bicycles. And what I learned later, if one crosses the river by boot from San Martin, there might be a charge to pay to walk up the hills. I can not proof this for I did not cycle all the way down to Quila Quina. 
Stage 16 I hiked as a roundtrip starting in San Martin. And I am pretty sure that there was a sign somewhere at the beginning of the stage which said hiking and biking.
Maybe the cyclingroute could be changed to lcn.
But the more important point is the hikingroute is not following exactly the same paths than the cyclingroute, which you now used as a member of the superroute. The hikingroute follows the path I mentioned in my second post. It is steeper than the route for the bicycles and there where signs with cycling prohibited on this path.
By the way I appreciate that you split the big route to the smaller stages.