for cuban species some one grow in calcareous soils , but others on serpentin rock , others on tree trunk , other in white sand but rich in organic matter below
you grow them in shade or full sun ? have you used, fish glitter, rather than a leaf fertilizer ?
P.cubensis grow on serpentine rock always wet then with a big air hygromety sometimes in full sun,always also in 20-28 °c , According to some authors it would be annual 'in situ', and may be triannual in culture.
I think that people more competent than me on these species will be able to better answer you.