I think the green in the stobartiana looks about typical and yes, hainanensis is green unlike the pics in Christenson's book. I don't think stobartiana is among the most difficult of the Aphyllae, but it is more difficult than non Aphyllae Phals.
I don't think your temps are out of line, even the higher ones. We frequently can't get below 70 at night in the summer and pretty much live with 85 in the daytime without any problems.
I'm not sure that photosynthesis of roots is all that important. Most of our mounts are moss covered (unlike the pic below of lobbii) and the plants grow really well. It seems to me the quick draining of the mounts is their most important quality. They are watered every day.
As to rest...Christenson mentions and we practice making every effort not to rest these possible deciduous species. If they drop their leaves they spend all the next year growing new leaves. I understand that in the monsonal natural climate they have evolved to go deciduous only if dryness requires it. It isn't necessary to their life cycle. In our experience that is true and if you want to grow a specimen plant you need to avoid going deciduous. The only one that has not grown gangbusters for us is finleyi (sometimes wrongly named minus). I think something else was wrong with it and now we have a new one to work with.
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Phal lobbii LUR_4932 by
kentucky4, on Flickr