I installed counterrotating vortex generators on a Skyburner several years ago to solve the tendancy of the a/c to drop a wing in the flare. This along with wing fences solved the problem.
I fabricated the generators out of clear lexan. There are 3 sets on each wing.
Maybe turbulators toward the leading edge would have had the same result.
A bit difficult to see in the photo, but they are toward the aft end of the checkerboard.

Jack