Flypaper2, your pictures show the same technique I have used on ailerons and on rudder. On my planes I set up the throws so that the tab was always very close to the same angle as the fixed part of the surface; i.e. when the movable surface was at full deflection, the tab was still parallel to the fixed portion of the surface it was attached to. I did not experiment much with aspect ratio of the tab, just kept it at less than or equal to 10% of the rudder/aileron but I suspect that the aspect ratio may have some effect on efficiency. In any case, it let me use rather moderate powered servos to do a gigantic job on the big planes. In former tests, I found that if I exceed the 10% rule it was easy to get over control with steady or uniform response to control almost impossible. When overdone on the elevator, level flight was nigh on impossible, tended to gallopeither climb or dive in an oscillatory fashion.