More influence from outside temp?

[Wheemer]

I am having issues where it will not keep close to the set point when outside temps get too low. I do have this temp configured.

Is there a way to have the outside temp have more of an effect? It seems that it is not behaving as expected. I would think when it sees our current outside temp as -20c then it should keep the furnace on that much longer to compensate.

This is my history: