I found out my sleeping bag's temperature rating is basically a guess

I was reading the fine print on my old Marmot Trestles 30 bag last night, prepping for a trip to the White Mountains. Buried in the manual online, it said the 'comfort' rating is based on a standard test with a mannequin wearing a base layer, on a pad, in a calm, dry shelter. It doesn't account for wind, ground cold, or if you're a cold sleeper like me. So that '30 degrees' feels more like 40 in real use. Does anyone else add like 10 degrees to the rating for a true comfort zone?

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