The wok is designed with a thick Center bottom that's for heating and cooking and the sides are designed to actually hold the food up off the bottom for it doesn't get scorched. The way the vortex works it puts that Center column of fire right at the bottom of the wok where it needs to be the real hot.
True that. My spun carbon steel I think is even thickness, but that is how woks are designed to work.
Are you trying to set a wok in the BGS grate? I find that unfortunately, it sits too low for anything.
I use a wok ring sitting on a disposable grate over the vortex. It works really well.
Theres some pics here with the vortex flame licking up the sside of the wok and the vortex itself glowing red:
http://weberkettleclub.com/forums/grilling-bbqing/vortex-wok/msg147164/#msg147164