My wife and I have several Sports; this might help you. Set your pedal length so you do NOT fully extend your legs, and learn to reduce the leg stroke length. If you don't bring the fins all the way up to the hull, AND, you don't bottom out the back of your thighs against the forward edge of the seat cushion, you'll find your long distance runs more comfortable. The fins drive the boat more efficiently when they spend more time closer to vertical....all the drive is fowards, versus trying to pull the boat down in the water as the fins approach the hull.
Use the long Turbo fins, with extreme low pitch (maximum swing of the blade as it flips at each stroke). This will match the Sport cruising speed very well, and slow down your stroke speed significantly. I actually lengthened the retaining eye link, to get excess pitch change.
We've done some fairly long runs, in Sports, such as a non-stop circumnavigation of Kingfisher Island, on Flaming Gorge Reservoir, and we believe the "low pitch Turbo fin, shortened stroke" method is magic. Besides....it's fun to cruise away from the other Sports while pedaling at half the speed!
FYI, we NEVER use the boats with the seat drain opened, and only get wet in rough conditions.
Regards, JimL