The reason for your stalling and smoking glow plug are one and the same, it's just running much to rich. Turn the high speed needle clockwise 1/8th of a turn and then try again. Regarding your break-in, I'm afraid the fact it never got above 200F actually means you haven't done a very good break in. One of the main goals during break in is to get the engine up to temp (about 200 to 220 is fine) allow it to cool and then repeat. This gets the engine in the habit of contracting and expanding and make it more resilient. Running cool during break in stresses the con-rod, especially when also running too rich as most do during break-in. Anyway, i digress, honestly don't worry about your break-in now, I'm sure you've done enough, that engine is a total tank anyway, just lean it off now until it starts to perform. Always make sure there is a decent trail of smoke, that's how you know that enough fuel oil is getting through the engine. Good luck, and be patient, tuning isn't easy the first fee times, it really helps to have someone experienced to lean on, but you couldn't have asked for a more user friendly engine than that one.
If no amount of tuning seems to help it may be the case that you have a significant air leak somewhere in the carb or engine itself, but that usually wouldn't cause the cutting out symptoms you describe.
BEFORE you do all that though, please answer a couple of quick questions...
What kind of temp is the motor at when it starts this cutting out business?
Have you messed around with the low speed needle?