So what changed to make it go from hasn't started since to will start but not throttle up? My thoughts are still on a blockage in the fuel system or a nicked line in the tank.

If you pull the needle valve out completely, put the throttle wide open (without a glow driver) and crank the engine through you should get a good flow of fuel coming out of the needle valve opening. If not there is something blocking it further up the line. You did flush out the fuel filter right?