dude, how are you going to alter the weigt distribution appreciably with riders on??? Are you going to adjust the distribution by selecting your stoker by weight alone? I don't think so.... we have what we have as teams.
we're 175/125lbs., so I'll bet the weight dsitribution we have is similar to yours. As you haven't told us what kind of road frame and what kind of tandem frame geometry you have, it is sort of hard to expect that the balance poitns are going to be the same. A criterium frame is going to ba;lance a lot diferent than a touring frame, etc....
I can take just about any corner on our tandem at similar speed to my single bike and I have raced in the Alps, Pyrennes, Dolomites many, many times so can corner pretty well. It's more about set-up, captain proficiency, tires, quality of the frame, fork, wheels, than weight distribution. I'd much rather have a stoker who's nice and light, if you get my meaning.....
Now... if yer loading up a touring bike for long work, then perhaps distributing the weight of the load makes sense. but I didn't read yer question that way.