This doesn't sound like a glow plug issue to me, PA BEN. My first impression was that the high speed needle is simply too lean.

If you're confident that you have the high speed needle set rich enough and the engine isn't really hot when it quits running, I'd recommend you go back through your fuel lines and fuel tank plumbing.

I had a similar problem with a Magnum XLS .52A that would idle and transition great, but would die when I revved it up to full throttle. I found I had a split in the fuel line inside the tank that connected to the clunk. The engine could draw enough fuel to idle, but as I revved it up the tear in the fuel line would prevent it from drawing enough fuel to keep running.

Good luck.