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A steam system like you have requires not only that all your lines be clean and that it's really turning the gallon or so of water that is in the system to steam and that it's doing so for long enough that it's reaching every radiator, I suspect that the radiators that busted open are the farthest from the boiler, or farthest from the thermostat that turns the boiler on, then they get water collecting in the bottom, as we all know evaporating water has a cooling affect, this not only makes a steam heat system work more efficiently then many other heating systems, it also mean that water that was just boiling will freeze quickly in a cold place.
Most anti-freeze solutions don't take kindly to heat over 260F, and they raise the boiling point making it harder to make the steam.
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