After reading the suggestion made by Yung I had to figure out how to use this information with my custom setup and so the simplest thing is what worked. I copied all the script files (…GoZApps>Maya) from the C drive default location and simply placed them in the X drive (…2012-x64>prefs>scripts) folder and viola…no more multiple instances and back and forth instant updates 
I am very pleased right now!
To those still have problem, just follow the instruction given here (I think originally by Young). I am using MAYA 2012, see, 2012, this is important because you have to use 2011 or 2012 in the script depending on your Maya version, I did not payed attention to that and I copied the script as it was originally (2011) and of course, it did not work until I replaced 2011 for 2012 (stupid mistake, but it happens).
First, the GoZ shelf didn’t appear until I moved:
C:\Users\Public\Pixologic\GoZApps\Maya\shelf_GoZBr ush.mel
into:
C:\Users\yourName\Documents\maya\2011-x64\prefs\shelves\
Then to get rid of the multiple instances I added:
eval (“source “C:/Program Files/Autodesk/Maya2012/scripts/startup/GoZScript.mel””);
to userSetup.mel (thanks pid18000!). This file lives in:
C:\Users\yourName\Documents\maya\2011-x64\prefs\scripts\
In my case, I DID NOT find the file userSetup.mel there, so I created one using note pad and I put in it the script given above
Then it worked perfectly