Read and understand the installation manual. The boost in not for everyday operation but for the rare occurrence. Setback has to be done with the radiation in mind. Every high efficiency condensing boiler available in the US features outdoor reset (ODR). This feature raises the system water temperature as the outdoor temperature drops, again this design temperature is determined by available radiation and local weather. It is best for the novice to set the ODR to the match the design temperature for the area in which he lives and the radiation served and leave it at that.
Most radiant systems will not benefit significantly with set-back and many will not keep up with the thermostat if not set up by an expert. I suggest you set the ODR and forget about set-back. The ODR will save a considerable amount of fuel without thermostat or water temperature setback. In fact, we installed a Lochinvar Knight 4 years ago in a 1924 bungalow located in St.Paul MN. After the gas company came out for the third time to replace the gas meter the homeowner informed them that the new boiler was the reason for there fuel consumption dropped by two thirds. On this unit we did not setback water temperature since the boiler was sized very close to the heat load and lacked the extra output necessary for any kind of boost.
Given a choice, I always design hydronic heating systems to run full time without fancy controls strategies most of which should be left to professional designers working on large homes or commercial structures.