Dry ice in ethanol

So we dunk 50lbs in 40 gallons of ethanol. We dunk in rounds. So 50lbs makes 23, 1000 gram bags. We dunk six at a time.

Problem is our freezer only gets to 20 celcious. I notice our yields are lower then others people. So I know if I get the Ethanol colder, we can extract more faster.
What I need to find out:
Do I put dry ice directly into the ethanol, and if i can will it lower the proof of the ethanol?
If I can get the ethanol colder how long should I dunk material?

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Yield should be higher w warmer etho

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How warm?

How would I go about doing a warm etho extract run

20c like ur doing is warm