So nice!
I’m so envious I can’t bloom mine lol.
I have done nothing special for mine...for the last few years, I grow all of my remaining ~25 orchids by the windows for the colder months and all of them spend 6+ months outside under a Japanese maple tree(in a shady spot--facing north). While they are outside, I only water and fertilize them once in a while...this one formed the flower sheath back in Sept., so it is all mother nature doing its job.
My books indicate its culture should be the same as P. hangianum...and you've grown a beautiful hangianum. Perhaps just be patient.