Dendrobium xdelicatum, kingianum, questions

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I got two Dendrobium xdelicatum back bulbs from our orchid society speaker in fall 2014. One I potted up here in Phoenix. The other I took to my mother (S Cal just inland from the coastal hills.) Mom's went into a 2" / 5cm square plastic pot with pumice and fallen leaves. We placed it outside on the soil surface of an Epiphyllum hanging basket, with water but minimal fertilizer. It made a new growth spring/summer 2015, equal in size to the back bulb. It stayed outside. When I visited at Christmas 2015 it was starting two flower spikes from the newest growth. It's going on the jacaranda soon along with the Laelia gouldiana 'Greta Garbo.'

The D. xdelicatum I kept here in Phoenix died in the spring heat on a shaded patio, along with a small D. kingianum back bulb. I may try with D. xdelicatum in the future, in the house for the summer.

At our April 2015 show I got a 3-back bulb division of D kingianum 'Roy' from a member of our local society. She said it can take heat. This clone makes larger pseudobulbs than many other clones. It made a strong new growth in spring 2015, but it wilted in the heat when I didn't water it enough. I left it on a shady patio for the summer, where it was exposed to our 110+ F / 43C+ temperatures, but no direct sun. This year's growth matured bent over the rim of the pot, but the same overall length as the back bulbs. In late October I moved it to my sun room, nights not below 60F / 15C and days often into the 80s F / upper 20sC. This plant is making a very vigorous new lead right now, despite my withholding winter water, so I've decided to begin watering and fertilizing it. The 3 back bulbs all bloomed before coming to me. The new growth doesn't have spikes, so I don't think it's going to bloom this year - or might it still?. Should I keep it outside next winter, bringing it inside on the few frosty nights?

I also got a couple of D. kingianum seedlings from Carter & Holmes this summer. On arrival I could see they had been grown as deep shade bog plants, and had no chance outside here. They looked like lush, shiny green ferns, complete with a moss carpet on the shredded cedar. I even had trouble getting them to adapt to living inside the house with 50% humidity. They are still alive, but I don't think I watered them enough, either. Just the newest growths have survived, and they have lost most of their roots. I'm treating them with KelpMax and keeping them evenly moist, but nothing has happened in several months. Do these tend only to root once a year?

Thanks.