I have a Sea to Summit TKII bag it says Comfort rating 30, Lower limit 18, extreme -13.

I am thinking about switching to a quilt for 3 season camping. I am unsure what the one temp of my bag is? Is it a 30* bag or a 20* bag?

I ask because it is slightly hot for me. And my MH Lamina 45* (which reviewers claim it’s more like 50) is slightly to cool.

If I go quilt should I stay with the warmer bag and vent it or stick a leg out? Better to have and not need them need and not have?