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Have you actually tested the glow plugs yet, or are you just going to throw money at it and hope you get lucky? Until you put a multimeter on the glow plugs and check resistance on each of them, and verified that you are getting 24V to each glow plug connection, you are potentially just...

All it takes is one failed glow plug to cause smoke. Several of the glow plugs are difficult to access, so not everyone bothers to replace them if the truck is still starting. I think for a while there I was starting my truck on only 2 or 3 good glow plugs in freezing conditions.

You need to check resistance on every plug, then also check to make sure every harness connector is showing 24V. It's not unknown for wires to look good on the outside but have high resistance or damage internally. The fact that it goes away when you increase the throttle or after it warms...

That really sounds like you have at least one glow plug not working properly.