Just some thoughts on how to get your "root monster" to bloom!!
First of all, your phal looks VERY healthy, so that's good! But it looks like it needs to be repotted to me. (I say this knowing everyone has different ideas about when to repot, but I've generally found my phals to be happiest when most of the roots are contained). I see that you've got the plant secured so it doesn't fall over, and if you put it in a bigger pot it will feel more secure, and you won't need to tie it down. So that's the first thing I would do if I were you.
The next thing I would do is adjust the fertilizer. Have you been fertilizing with a typical orchid fertilizer? If so, they're generally high in nitrogen, which encourages foliage growth, but not flower formation. If you have been regularly fertilizing with a high-nitrogen formula, you may be shooting yourself in the foot, because you're basically telling the plant to grow, grow, grow more leaves! LOL That's great for plants that need to build up new growths before they'll bloom again (like paphs), because it will help those leaves grow in faster and therefore lessen the time to blooming, but phals don't need to grow lots more leaves before blooming again.
You can switch to a "blossom booster" formula if you like, or you can take a break from fertilizing altogether. If you've been fertilizing regularly for quite some time, it might help your plant to have a rest period so it can save up its energy for flower production.
This is how I generally get my phals to rebloom:
When the spike dies all the way down, I chop it off at the base of the plant, then I move the plant into a lower-light setting for about a month. During this time I don't really fertilize, and I water a little less. This gives the plant a rest. Then, after about a month, I'll move the plant back to a higher-light setting, water more frequently, and fertilize. After a few weeks, the increased light and water usually triggers the plant to throw out a spike.
It seems like you've already moved the plant to a lower-light environment, right? Then you noticed the leaves were growing in darker, so you moved it back? This is exactly what I do to encourage spiking, so I would leave the orchid in the higher light and lay off the high-nitrogen fertilizer. A blossom-boosting formula with less nitrogen would probably help.
Lastly...don't lose hope! I don't think you've been doing anything wrong...I've just found that sometimes phals need a little "kick-start" to get them to spike after a period of leaf-growing or root-building (which it looks like yours has been quite busy doing! LOL)
And don't despair about that spike. The very first time I rebloomed an orchid, it was quite by accident...the plant had gotten knocked over and the spike had snapped. Wouldn't you know...within a few weeks it grew a whole new spike from the node right below the break. Then it bloomed! I was amazed...that was how I learned where to cut the spikes when the flowers fall off!
Good luck, and make sure to share pictures of those pretty blooms when they finally arrive!