Mine are grown under the branches of a large Macadamia nut tree where the shade is really heavy and the light they get is mostly reflected from the ground around. Air movement is free and I think this is key, along with water quality, as well as temps and humidity. I have been growing vampira, erytrochetae, mopsus, nycterina, inaequalis, gigas, astuta, lotax and chimaera this way and they are doing good. Most of mine flower during summer except gigas (fall), nycterina (spring, summer and fall), lotax (winter). I second Ross, I fertilize little, less than one time per month I'd say. I keep them humid all the time during spring, summer and most of fall, slowing the watering down a little during the winter.
Some Draculas bloom easily form me, some don't, like D. vampira, which I've been growing for six years (already adult when I got it) and saw its flower for the first time last year (I have two buds forming now
!!).
For you to have an idea, I am under the Tropic of Capricorn, the altitude here is 930 meters above the sea level. Nights are cool during fall, winter and part of spring and fresh during summer. Day temps are hot during summer.
Hope this can be of some help.