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That near-boiler piping will never work right. For starters, there is no header. Then, the riser from the boiler looks like 2-inch, and there is only one riser where there should be two. The result is water is getting up in the steam mains, causing the problems you cite.

This boiler has the name Lennox, but is a re-branded Dunkirk. Dunkirks are extremely sensitive to improper piping.

It needs to be properly repiped. Period.

Ok, we're live!

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https://www.castrads.com/us/product/windsor-1ps-trv/

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Thank you all for your help with getting this together. I'm very proud of the final product and I hope you all enjoy using it.

Has this boiler ever been skimmed?. It looks to me that the near boiler piping although far from textbook should work. My only question is if one or two risers are required for that size boiler. Check The boiler manual

How is the boiler water level when it is steaming? Violent fluctuations of the water level? Or steady water level meaning gentle movements not exceeding 1" up and down

Watch the thin aluminum pilot tube that carries the gas to the pilot if you have to remove the pilot burner. It crimps, kinks and cracks easily. Its retaining nuts can also loosen. Not a big deal,but if you damage it you'll have to replace it.

It just has a nut that screws in to the baso switch and a nut or clip that holds it in the pilot burner. On some boilers you can just reach in and change it, others you have to remove the main burner assembly. Some main burners come out around the manifold, others you have to undo some piping to get it out. You need to put everything back where it came from. It isn't a super complicated project but on some boilers it is harder than others and there are a number of ways it can be dangerous if you don't do it right.

Did they repipe it after they installed it or is that how they installed it? As I see it they used a cheap vent and didn't fix some issues someone in the past left behind. They didn't do the best job but didn't do an awful job either.

I'll go with 3 as the most likely. And no, steam vents shouldn't be at the top of the rad.

At this point the vent is probably toast as well.