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Massively vent mains, too?
I have a two pipe vapor system. I understand why it's a good idea to massively vent the dry returns to reduce back pressure. Should I also massively vent the mains? There's one vent there now. My concern is that by lowering the back pressure on the mains, the steam will just zip around the mains, back into the boiler. At least that's what's happening in my head as I picture this. (Just to be sure that I'm using the term correctly, by "mains" I mean the pipes that supply the steam from the boiler).
1929 Ideal Heating vapor system.