You will get banned for modding gamerscore, its just a matter of time. I recommend using gamesaves (not even modded ones, just 100% complete or 900/1000 gs ones) if you want to avoid getting noticed. Also, do not mod online achievements.Can you get banned for modding gamerscore?
Off topic: What mobo do you use?You CAN be banned, but i haven't.. I've modded my gamerscore on 2 different profiles... all they did was reset both of them... I people say they've be suspended or banned for it... But i haven't..
And if you can't move your profile to the USB stick then Recover your profile, to your USB stick (When recovering instead of clicking Hard drive, click USB)
Hope i helped.. If you need help with this reply to my post or send me a PM, I'm very good with modding!