Just one little thing that I would like to clarify. Cephs naturally grow in very anaerobic substrate. I am told that it is extremely smelly when distrubed, such as when you wade through it get to the plants growing in those soils. So the issue with potting mixes is not so much that they are anaerobic. The issue is that they need the movement of water through the substrate to keep roots healthy.
As we don't all have flowing water through our pots, increasing the movement of air helps with this issue as well, so increasing the aerobic nature of the mix is therefore necessary if the plant is to remain in those conditions long term. Giving it plenty of water poured through the pot and low humidity will also work, but it is easier to just improve the air flow in the mix.
However, as you are in winter, reducing the watering is clearily the best option. I tend to leave my pots sitting out of trays or in dry trays in winter so any water that they get runs straight through the pot.