The light and humidity conditions sound fine. They may not be getting enough of a chill. I don't have that particular variety of S. coccinea, I have a "big" 4N. And also have some other species (cernua, mantiqueirae, brevipedunculata, wittigiana) that also bloom for me. What they all get is a significant chill in winter (2-4 deg C at night) and fairly cool nights in summer (18-20 deg C). They seem to be able to tolerate warm days, but really prefer cool. They're also getting a fairly significant temperature variation between day and night. So I think that temperature, and temperature variation, are factors to think about, to make what adjustments that you can.
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