A small update:
So, what have happened after my first post was made? Well, except me getting depressed and feeling like the worlds worst Paph owner, I tried to change everything.
* I raised the T5 (it's currently 18" above the Paphs, and I'm thinking about raising it some more).
* I reduced the hours it was on (as it wasn't necessary when the morning sun was shining through the windows).
* I shaded my orchids from the sun (which I always do, but better to be clear about it).
* I changed fertilizer.
The result is that the roth that had turned almost yellow, Starship x self, is now almost back to the same green it had when I got it. Overall, they've all greened up and shown signs of better growth.
Since I changed so many things, it's hard to say if it was only a light issue, or if it was something more. I'll start using k-lite again and see what happens. Hopefully it was only a light issue and nothing else.
Anyway, thank you all for all of your many, MANY suggestions and tips. I thinks it's thanks to you that the victims seems to be restricted, so far, to only two Paphs; my smallest roth Kim Crull x Canadian Club, and my biggest philippinense var roebelenii.