That's strange it was such a sloppy fit. My 6mm hex fit perfect. I did notice the hex head fit pretty far into the plug, farther than normal (or at least to what I was used to). So i would verify that your 6mm tool goes all the way in. Not trying to insult your intelligence, just noting it.
Witchdoctr has some nice after market magnetic plugs for very reasonable prices.
2012 vegas 8ball