I'm using jacks classic blossom booster 10-30-20. Similarly 1/4 tsp per gal of DI water. I also regularly use superthrive in all its delivery methods. I do not fertilize at the recommended periodicity. Typically, only half as often. I will sub in superthrive when not fertilizing.
Nothing about your posts makes me question if you know what your doing. I recieved a tip from a more seasoned orchid grower that has worked for me. When your doing everything else right, try looking into the lowest temperature that it can handle and holding that temp for several hours. You are likely to get a spike and the resulting inflorenscense will be determined by the number of hours at that given temperature. I will be doing this as spring approaches for my stubborn Dendrobium Spectabile. What ever happens I'll post some photos.