AM03GT, I usually start with any of my BrushLess at 11/53, stock to open. Then if I need more out of a turn I'll bump down a tooth, or if I need more roll through a corner I'll bump up, then adjust the throttle d/r to adjust speed for the track. Really just a personal feel. I'm just getting started with a true open chassis, and learning the GL ESC, but it's settings don't feel much different than the ICS settings on an 03/04EVO.
That said, for me when I've been learning and getting faster, no matter what car i'm driving, I'm usually within .3-.4 on my lap times. Now my overall times will be different as I can recover much faster with BL vs. BoxStock.