Following as I'm interested to see what others have created. We spin at each end of our club lake (1,700' per Google Earth) and after 3-4 passes have rollers down the lake.
My assumption is you shouldn't have rollers if you can follow and "ideal boat path" into the course. My assumption of an "ideal boat path" consists of the boat pulling the skier out of the water running parallel to the course in the opposite direction then makes a tight turn until aligned with the course and straight into the 55's.
South end of our lake allows for an "ideal boat path" with the boat starting parallel to the course, making a tight turn and driving straight into the 55's. This side doesn't seem to be the issue.
The shoreline on the North end cuts into the boat path on the not allowing for the "ideal boat path" before the 55's. Driver starts with bow pointed slightly away from the course, makes a tight turn and then follows the shoreline before aligning with the 55's. I'd venture to guess this is our issue.
I vaguely remember having seen a floating turn island on the north end of this lake when I was really young. Seemed to be like a few dock floats with plywood hanging off the sides allowing wakes to dissipate before running down the lake.