Love my HG Phoenix 20* with 2 oz. overstuff. It's served me in temps from 74* F to 15 degrees. However, I want a full-length 0* Incubator for Christmas. I can't decide if I want overstuff or not.

The Phoenix should be good to 10 degrees (24.5 oz), and my initial inclination is to get some overstuff in the Incubator (28.5 oz) to lower my temp range. Is 2 or 4 oz overstuff overkill, or can I still use the Incubator in temps up to 50 or 60 degrees?

I'm torn on the overstuff.