I did a lot of testing with turbulator strips on glider wings, and could not see a difference in
the stall behavior of the model.
Modifying the wing with washout achieved results.
I've seen turbulators on top of the wings of a Learjet, amazing.
You'd think it would ruin the lift.
I think turbulators only work on fullsize airplanes because of Reynolds number,
and air viscosity.
The freeflight Nordic gliders of the 50's used a piece of thread strung ahead of the lead edge,
the competitors swore by them, but I never understood the theory.
I'm tempted to try some sort of turbulator on my scratchbuilt AT-6, it has a bad tip stall