Shade gardener, thanks for sharing your experience.
My plant lives in a 5-gallon pot, and I make the inside/outside transition by temperature as you do. I just divided and repotted, the pot is filled with shoots connected by very skinny (maybe 1/8" inch?) rhizomes. Do you deliberately keep your plants thinned? That might be another thing I should be doing. I could be watering more, but my plant(s) looks very green and healthy, with new shoots all the time, so I have thought I was providing sufficient water. I could also give it more light, but again, if a plant is growing well, I tend to think I am giving it what it needs!