Tonearm Grounding Problems.

I need some suggestions concerning my Orbe/Graham 2 set-up. Since buying this combo I have had major grounding problems and I cannot seem to get them solved. Of course this was not helped by my Graham bellying-up either. My electronics are Naim if this helps.
My major problem is that if I wiggle my tonearm cable I get sharp pops and loud bangs to occur. I have tried 4 different cables and separate phono stages but nothing helps. I have tried cheater plugs to float the ground and a separate grounding wire attached to anything I can think of but it does not help. At issue is wheteher it is the arm the preamp or my house wiring. It is not the Ruby 2 or the arm wand that I know for sure. But because I have had trouble with the arm before it is the major suspect.
What is causing the discharges and how can I defeat them? Any ideas? I assume that the fifth pin of the mini DIN conneccctor inside the Graham is a internal ground for the arm. What exactly is it connected to?