This is a helpful thread, thanks to everyone for their input.  A couple years ago my sister rented a Bell solo with a lot of rocker (I forget the model name). I tried doing the Minnesota Switch but could not get tracking at all.  The C worked best for me, but it was still a learning curve (as it were).

Paddling a tandem is so intuitive for me, getting used to the solo without the offsetting stroke of a bowman on the other side is a challenge, but a fun one.  Double blades wear me out, so I'm going to stick with working on mastering the single blade in the solo.  Besides, to me it feels "right" to have a single blade in a canoe.