Believe it or not I had one stubborn orchid too, she loved to give me new growth and lovely green leafs, one day I had it with her and told her that as much as I love her leafs, what I really wanted was some blooms (my husband hear me talking to the plant and though I was nut!
)
Now coincidence or not, with in 3 months of that little talk, I got beautiful bloom and I was so excited that I took a picture of it! This pictures were taken in February, after 4 years of no flowers.
So if your done everything, maybe a good talk will do the trick