Creating drag provides great wind control. Another tape trick is a half inch trailer of tape flowing behind either wing. Boomerangs with holes drilled in them make great wind rangs. The holes create drag and can be drilled anywhere from the tips to the elbow. The holes create a tremendous amount of turbulence and drag.
Experimentation is the only way to learn the art of weighting and tuning.
Every different boomerang style has its own specific flight characteristics due to its aerodynamics, wood density, and weight balancing built into the 'rang. There are too many variables of design for weighting rules to be iron-clad so don't be afraid to experiment. Sometimes combined ideas produce the desired effect. Weighting can be used to adjust the flight of a particular boomerang to your particular throwing style. Once you are getting consistently accurate returns - begin moving a weight, or weights, around the boomerang to see what the results are.