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outdoor reset and thermostat setback
I have a Viessmann 200 that uses outdoor reset to modulate the boiler, usually there is nobody at home 13-14 hours a day for six days a week. Thermostats are programmed to 68 when no one is at home, then 71 just before I come home at night. I understand that a bigger setback often goes against the outdoor reset, but for 13-14 hours away time would a bigger setback be justified in saving fuel or should I just leave it the way it is now?
My second question is regarding the heating curve of this boiler. My bedroom is a separate zone and I set the night time temp to 68 and 71 in the morning, in reality the room temperature struggles to reach 70 (sometimes only reaches 69) after 90 minutes of preheating. I could solve it by either increasing the "slope" or "shift" on the heating curve, but I want to know which one should be adjusted first.