The best results that happen for me are to mix the powder with warm distilled water (tap water my contain some chlorine that will have a small adverse affect on the smb solution).
I let the auric chloride sit for a day or two to let some of the chlorine gas to escape then double the solution with water for the smb to work its way through more efficiently.
Add the smb solution and stir, stir, stir. One way to know the smb is working is that you will get a bad smell that you will almost "taste" and you will see the color change of the yellow to the clear/dirty brown.
What was your steps getting to the auric chloride? Maybe the problem goes back a little further.