You can add to your list of attributes that the CC hybrid has pink pollen and the flowers only come in 1 color. The blooms are actinomorphic.
S. truncata plants have yellow pollen, come in many colors of bloom, and the blooms are zygomorphic.
Your EC sounds like it's getting too dry. Jungle epiphytes would never get "bone dry" in natural habitat. It's all about the soil type/texture. If one is using peaty potting soil, the risk of rotting the roots of any potted plant is higher than necessary. Letting plants dry to unnatural levels to avoid root rot is much more difficult than using a type of soil that has more air in it so roots do not rot when the soil is moist.
