I've had fishon's bumping method work for me. I've worked brush around the edges then deeper into the brush with out catching any until I've been hung up in it and had to pop and bang the jig around trying to retrieve it only to have a crappie take it in the process of freeing the jigs.
After that I would really try to bang the jig around on the brush and it kind of seemed like I was just knocking on the door down there trying to wake the fish up.
This is similar to working opened water going for fish on the bottom where I will be bouncing or bumping the jigs on the bottom to entice a bite.
“There is no difference between communism and socialism, except in the means of achieving the same ultimate end: communism proposes to enslave men by force, socialism—by vote. It is merely the difference between murder and suicide.” Ayn Rand