Macrocentra said:What Baja said.
I find my K. tomentosa is one of the thirstier succulents I have. I water it a bit more frequently than my other plants, but still waiting till the soil is completely dry. You don't want the roots remaining wet for extended periods of time.
Baja_Costero said:Werner Rauh, in his Madagascar book Vol. 1, places it in his chapter on central plateau/inselberg succulents. These are plants that grow on granite or gneiss rocks between 1000-2000m elevation. Meaning they are relatively high altitude plants (read: probably heat sensitive) that prefer a rocky, fast-draining substrate (read: sensitive to rot in overly rich mixes if you don't compensate with the watering and/or protect from rain). The climate in habitat has summer rainfall and a winter dry season. This plant tolerates day-long sun here in our mild coastal climate. Perhaps my description of the plant's origins helps make sense of your own experience.
Baja_Costero said:I'd say it's probably time to quit the habit of using pots without holes at the bottom, or nest pots with holes inside them so that they can be removed for watering. Holes let you water deeply, to saturation, without leaving a lake at the bottom. Pots without holes require much more attention and fine-tuning (or skill) to get good results. I would consider that above my skill level.
Wait until spring before performing any major intervention.
The more light, the better for this plant and most succulents indoors. I would assume that's especially true for the ones with hair or dense spines.
The fuzz can get wet but it cannot remain wet. I usually try to water the soil, not the plant, avoiding the foliage unless there's no other way. As long as there's decent air circulation and strong light, I wouldn't worry about the leaves getting wet when you water.