Went on a lunch time ride today and one of my twin sons tagged along (34 year-old, working two jobs, finished school, living at home, looking for a job, .....). Wife and I are clearly older than 34, new to tandeming, but very competitive and I would really have liked to have dropped him! The reality is that he's young, strong and has picked up his bicycling over the last two months, but you would think on a tandem ti would be close.
OK, so the ancient ones have got to get stronger, but in addition our efficient cadences don't have much of an overlap to as I approach 90 rpm I've got to upshift and may actually slow us down due to my loss of efficiency. We've got a 12-27 cassette and I don't want to go with anything with a narrower range.
I'm sure this is very common when a team is starting up. Did you find that the stoker was able to up his/her natural cadence on the tandem or would work on a single (road or trainer) be more beneficial? I should add that this is one area in which our daVinci is probably at a disadvantage to a conventional drive train. My wife is getting a new single and our LBS has spinning classes over the winter so I'm hopeful of being in sync by next spring.