We seem to shift between full scale tab comments and actual use of tabs in our models
aerodynamic counterbalances are used in some micro designs -to remove loads on the tiny servo motor setups (the 6400 series rx/esc/ servo setup on UMX Extras is an example).
These make a big difference whre the "tab" approach can not.
The coupled tab reduces loads at small surface deflections- the " forward the hinge line" approach becomes more effective as deflection increases
We have been playing with the various aids developed for use on indoor aerobatic models
some of these seem wierd but in using them - they do work
fences , drag plates, angled tip plates for side force etc., all interesting approaches to increasing control and or controlling speed.
You can control a model quite effectively with simply changing drag at various points - -just like sticking your arm out on a bike - it causes a shift in center of drag.