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May I recommend a few things?
1) Bright indirect light - I try to give my nobile-types the brightest possible indirect light I can. I have them positioned (we grow them outdoors year-round here) so that they get no direct sunlight or perhaps only a bit of morning sunlight. It does depend on where in the world you are and perhaps more importantly what season you're in. For example I can let many of my orchids get full afternoon sun in winter but in summer even just an hour of direct afternoon sun will fry them.
2) Potting - All of my nobile-types are severly underpotted, meaning pots that appear to be too small for the size of the plant. For example I have a Den nobile var virginale that is about 18-inches tall but it is in a pot that is only about an inch and a half, maybe 2 inches wide (it's a 50mm pot whatever that is in inches). Underpotting is important because it simulates the tight cracks in which the plants would grow in the wild. It also allows the roots to dry out in winter like they want to. So consider repotting, checking the roots, and repotting into substantially smaller pots.
3) Watering - It is summer for you in GA now and so your dens should be in growth phase. They take heavy watering during growth. Your dens don't appear to be in this growth phase just now. Their growth/flowering cycle may be off.
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