Wow that Sam thread you commented in was like 2 and a half years old lol.
GrubKiller101 is my gamertag. I got my first XBL Gold this Christmas (2011). My ranking up to level 40+ was done in private matches / horde / beast with normal bots. So my current rank does suggest I am way better than I actually on when online.
Now in May 2012 It looks like I'm going to have to give up a lot of online gaming. Arthritis in my hand is getting to the point its becoming painful just to reach out and open my fingers eg to pick something up. Its always worse after playing Gears and is why I hardly use the Hammerburst and try not to use the gnasher too much (repetitive triggering). I did change the trigger spring tension with the idea I wouldn't have to squeeze it as tight as I did but I get so into some games I just can't be light fingered. I hit the trigger too hard and that's it! The pain starts to set in. Maybe I'll try the left handed layout.