G07's are known for this curl. If you didn't do a cap kit yet, do one now. However, it might not remove it 100%. My Frogger had a nasty curl after I capped it. It took a lot of careful adjustments with the pots to get it out. My Pac-Man has a curl on the right when I turn it on. After it warms up, it goes away. I have no idea, I capped it.
Read this too!:
http://homearcade.org/BBBB/g07notes.htmlThis is what I had to do with my FROGGER: "Fifth.. after reinstallation of the chassis adjust the H hold for a center point without the curl."