On a std 6 wing, use the std mounts. Moving the wing forward really makes it loads better, particularly jumping. Basically you want to move it as far forward so the mounts are on the flat part of the wing before it turns up at the back. The latest wings from X Factory actually have a new dimple at the back for this position. In doing this you either need to take a little bit out of the wing like Ellis does (to clear the top of the shock tower) or cut a section out of the front edge of the wing, like I do
http://www.oople.com/rc/photos/south.../NO5E1237.html . Having tried Losi mounts at the front, I felt it was no better, looked worse and made getting the shell on and off difficult, I strongly advise the above.
Also I NEVER run the X6 wing with full rear gurney, usually only a little lip at the top of the angled section. Over winging it can make the balance really odd and jump very nose high!
Gary, when you say you kept ripping threads out do you mean you broke a set, then put in more new sets and kept breaking them, or broke a set, then kept glueing the screws in and the kept coming out???