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Yes, an old topic but...
If you think well vented but oversized boiler, (approx. double the needed output for the EDR), the system spends much of its time cycling on pressure until the thermostat is satisfied.
If the pressure is raised at the boiler it will run longer and cycle less. The boiler builds pressure but the higher pressure steam is also hotter, so the steam that replaces condensed steam in the radiator is hotter. Hotter steam increases the EDR of the radiators heating the room faster, which should decrease the total run time of the boiler. If my interest is to save money on the gas bill, why is some pressure bad?