Ah.. Ok. I understand.

Do you know that you have two needle valves.. high speed and low speed. The tough one to adjust is the low speed needle... but you seem to have good low end idle so it's just the transition to high speed.

If you removed the flywheel, are you absolutely sure that the shaft turns without any binds at all? That the prop rotates freely (of course, with compression, but I think you understand my question). If so, then completely remove the high speed needle valve and make sure that the fuel path is clean. If it is, then replace the high speed needle valve and turn it all the way in. Now rotate it out 2.5 turns. For most engines, this is a good starting point.

Now try to start the engine. During all the sequences, leave the glow driver attached. Run it slowly to full throttle. Watch the exhaust. Is it spitting out raw fuel by any chance? If it is, then it is way to rich and that may contribute to its not going to full RPM. If it is not, and it still will not go to full, well, adjust the needle by leaning it out in 1/8 turn increments by rotating the needle valve in, go to idle, wait a few seconds then go to full. Eventually, if it's loaded up, it should begin to clear. If it's to rich, it should begin to go to full RPM.

If it still does not, then I am not sure what to tell you from here. You could always replace the glow plug and see what happens, but I doubt that will fix it... but anything is worth a try, especially something as easy as the glow plug replacement. Use an OS8 or OSF plug.

CGr.