db, I'll take a stab. Some older tandem were designed to paddle bow light,,,bigger guy in the back and the light weight/lady in the bow. Your old tandem may be designed to work best that way. Plus a tandem being built for two (fuller design), your trim was probably pretty close, or not as sensitive as a true solo design.

The Prism may want a more level trim. Since KF set it up with the seat back some, you probably put all your gear in front??? maybe??

Anyway wind will push the end of the boat that's not as deep in the water away, like a weathervane. Even moving a small bag to the far end in the stern could have made a change you would notice. In general a solo designed tripper would put the heavy load behind the paddler, close to your back side,,,,and maybe a lighter pack in front, beyond your legs. Adjust as needed and experience in different winds tell you. The front of a solo is narrowed up some not just for speed but for a comfortable paddling position, so you can reach the water easily.

That's all assuming you were bow heavy and turning into the wind. Maybe that's not what you were asking about? I probably restated what you already know.

As far as glide. It might be you were paddling a lighter total mass. So you noticed the acceleration improved, but you had less mass in motion and slowed easier too.