Too cold and you wont have any fats, sugars, or waxes present. You need fats/waxes/sugars to form a slab. They aid in inhibiting the formation of a cannabinoid lattice structure (crystals), and promote polymer style chains around the cannabinoids (slabs)…
If its dry material, you dont even need to heavily chill your system if you use CRC. You can make those CRC slabs running lile 5c-0c and a little CRC. Just make sure you pour thin enough.
Live material needs to be kept below 0c, to avoid thawing. Try 0c to -10c. If you need color adjustment, only CRC the amnt you need. Too much and you may strip all the fats/sugars/waxes too even if its not ran super cold.
I wont let anyone know media ratios, find out yourself. I had to.
My CLS brothers never directly taught me any of this info when we were all groundbreaking years ago lol. We all found out on our own accord.