Phal with no spike, but has a root that won't stop growing

[Chani]

Hello everyone! I'm a newbie and have posted just one thread previously on orchidboard (about snow boots, actually). So here's my issue. I have one phal and it just won't spike no matter how much I will it to.

Possibly relevant information:
It's a no-id phal that I purchased blooming last Spring, I believe. It was potted in pure sphagnum, and I repotted it in a mixture of sphagnum, large sponge rock, and medium cork chips. When I saw one of the roots was starting to rot under the conditions, I added a number of holes in the pot and have not had any root rot since. Since then, it has sprouted two leaves and a number of roots. During the growing season, I fertilized at half strength for three weeks, with the fourth week being pure water. During the dormant season, I've been fertilizing on the same schedule, but at a quarter strength. I would love to give you exact details regarding the temperature, humidity, and light, but I don't have a device that measures those things at the moment. I can tell you I have it on a windowsill facing approximately southeast. It has been incredibly cloudy the last few months and I'd say the main source of light for my orchid is my dinette light. I don't know the humidity, but my plant's aerial roots aren't shriveled in any way, so I imagine the humidity's sufficient. The daytime temp in the house is approximately 70 degrees Fahrenheit and I drop the temp to about 60 degrees for a few hours every night so the plant feels the chill of the winter.

Okay, so I know that's a lot of information and probably not all relevant. So back to my main problem and the title of my post. I've had no spike yet, but, one of my roots hasn't stopped growing. All of them minus one stopped growing a few months ago, yet one just won't stop. It's growing very slowly, but growing nonetheless. So I was wondering, could this be connected? Is it possible my phal isn't spiking because this root isn't growing? I know usual reasons for lack of a spike are the lack of light and not feeling that coolness at night. With my phal in its current location, I can't help in either of those two areas. There's just one other location in my house where I might be able to provide better lighting and a longer chill every night, but that same location has lower humidity and is too cold during the day, I believe.

So what do you all advise? Leave the plant where it is, wait for the root to stop growing, and see if it spikes? Move the plant to the other location where the daytime temps are too cold and the humidity too low? Any way to give that root a clue that it doesn't need to grow any more?

Thank you in advance for your help and I'm sorry for the super-long post!