I built a wire holder onto the torch part and a tool to hold cases so I can position my cases in the same exact spot every time..I also spin the case in the flame to get even distribution of heat.
I'd be interested in seeing the 'wire holder' or fixture and tool you made. I spin mine constantly while heating, but just do it by hand (wearing gloves) so it's a bit awkward. About the only cases I anneal are being formed into something else, like .280 AI or making .25-284 cases from 6.5-284, or .243 from .308, or .219 Zipper from .25-35, etc.