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Help setting proper pressure for steam boiler.

I have a Honeywell L404A pressure control with settings you see on the photo below. I have cast iron baseboards all around two story house and all of them are hot while running at full steam. It seem like it gets pretty even heating, however there are some problems.

Specifically it’s water hummer, short-cycling. Also there is some water inside baseboards, since I can hear gurgles and sometimes water comes out from air valves. Heavy water hammering is mostly on the first floor of the house, the second floor just has some gargling.

I’ve read that high pressure can lead to hammering sounds as well condensate to stay up in the system.

What should I set the “MAIN” psi setting? Also what “DIFF” scale indicates and what should it be set to?

Thanks in advance.
photo (5).JPG
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