Hi and welcome to the forum Sii
How long has you're phals been in the sphag media?, its looks spent.
I would repot and not use any ferts for a couple of months, flush out the roots. I think it needs to start over in clean fresh media.
I'm not saying a tempt drop won't help, but I've never had to do that with any of my phals, they bloom twice per year.
Maybe some phals are just more stubborn then others, I dunno.
Don't give up - this is a great hobby, you'll get these suckers to bloom have faith eh?!