Nice job Tom.
This is one of the more difficult formosum type dens. From the various conditions I've seen them growing, I think you've hit it right on. It is on the intermediate side of warm and your light sounds good.
They are very tricky to grow since they produce very few roots ... more for clinging than for heavy feeding ... and with the skinny canes, too. I agree that mounts or a very coarse medium are best. I've seen them in sphagnum, but not for any extended time, since you want to protect those few roots from waterlogging and they need the air.
Here's a photo of a primary of tobaense ... Den. Peng Seng (tobaense x cruentum). The cross was originally made in Singapore, then remade in Hawaii. The cruentum is warmer and more vigorous, so the hybrid is also more vigorous in den or cat light. The flowers are not quite as intriguing as tobaense, but close enough for anyone who has difficulty growing tobaense. Peng Seng might be a good alternative.
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It' s such an awesome bloom that I hope to see something like yours soon
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