Do you know if there is a difference between the older ones having less friction or do they get easier to pedal as they are broken in???? I wouldn't have noticed a gradual breaking in.
I had planned to install the Turbofins on an older drive for the same reasons you did. But my old drive is pre-pitot tube, and I wanted to use the tube for speed comparisons. So the Turbos are on the new drive for now.
With the new drive though, I found that by loosening the cable tension nuts slightly
helped the drive operate easier. Hobie probably wouldn't approve, but as it stretches, it's easy to cinch up.