Welcome! Here are some tips for using this forum.
Imbalance and short cycling
Our boiler was badly piped with a single riser coming of it, no header and no equalizer. I repiped it but still appear to have the two major issues that started this process.
The heat is massively unbalanced. It is much warmer on the second floor than the first floor. I moved vents around last year so the bottom radiators have fast ones and the second floor has slow ones (Gorton #4). It only slightly helped. The radiators on the first floor are probably half the size overall of the second floor but I understand that radiator size might not matter since it won't change the amount of steam being delivered to the radiator, so I'm more than a little stumped.
ALSO, the boiler is short cycling from pressure. The main seems to be well vented. It runs 20 minutes or so for pressure to build (I assume the air is clearing) and then begins short cycling in periods of 1.5 minutes on and 1.5 mins off. I sort of wonder how the boiler survived 25 years.
Given the shortness of the cycles and the heat on the second floor, I tend to think the two issues aren't related but please correct me if wrong.