Wing tip vortex generators or SFGs have the same function- when air approaches a thick wing, it doesnt like to go over but slides sideways over the wing. This washoff combined with the tendency of high pressure air at the wing tip to roll over the wing tip into the low pressure air above causes the tip of the wing to stall earlier. SFGs simply prevent that by acting as a fence. In the older UCD 60, this same effect was achieved by the triangular wing tips. These days is probably more "fashionable" to have SFGs, not triangular wing tips.

The toe in is probably there to line up with the air washing off. If it was not toed-in, the sideways force acting on the SFGs would simply snap them off. Remember, the idea is to straighten the airflow, side force is only in name.

This type of airplane is mostly a stunt airplane, not meant for flying circuits. If you intend to do that, dont install the SFGs. Its meant to be be flown mostly in one place, silly as it may sound, mostly in the vertical plane. If you fly too fast, the air going over the top surface will separate from the surface causing intermittent pulses in pressure. This will cause tug at the ailerons causing flutter and will lead to a crash

Ameyam

Ameyam