Wet you finger tips before adding dubbing to the thread.
When dubbing, pick out how much you think you need for the fly, then reduce it in half.
Apply your dubbing in one direction, clockwise or counterclockwise.
It is perfectly acceptable to use dubbing wax especially with unruly synthetic dubbing.
A washed out mascara brush makes a more delicate dubbing brush
A popsicle or wooden coffee stirrer with a piece of velcro glued on also makes a excellent dubbing brush.
Follow the link below for Dubbing Techniques (bookmark it!)