Well, congratulations on a new flower side spike! You are obviously doing fine on the cultivation techniques and your Phal likes it - well done. And now you'll discover what colour it is.
I think that repotting now would still be fine, I have repotted several phals at this stage, and even in flower. It may stall for a week or so while it adapts to bark mix instead of moss and you'll have to monitor watering with care, but you seem to have got the hang of that.
As for growing towards the light, try turning it - mine seem to like to grow parallel to the window, but they are in east and west facing windows. may be the attractive powers of midday sun are just that much more persuasive