I figure there is a reason why you never see it done that way.
I'm pondering leaving the trailing edges of the ailerons square. The manual says to round them off. An older 4* I have that was built by some one else is done that way. He built several over the years. It always flew and landed fine.
As far as the turbulator thing goes, if that is the case then loosing a little lift is ok. My stock 4* is a bear to get down if there is much wind. I've even landed it with the wind cause going into it, it simply just won't stop floating. That's one reason I clipped the wings.