Hey Nickle! I'm in So Fla too. I have to say, I have trimmed a lot of phal spikes and I have never seen one ooze anything.
That is odd. I have seen half yellow leaves. Think of it this way: it still has half a good leaf. I wouldn't cut it off unless it gets mushy, black, moldy, etc. Sometimes this could be due to an injury. Is the leaf partially torn away at the base? Still what concerns me most about this plant is the lack of new growth. With leaves that big there should be additional growth from the crown. I see no evidence of crown rot but this plant is not thriving. What I am going to tell you now is just my
worth. It may be hard for you to grow a phal in moss and a plastic pot in our humid conditions. To me the easiest way to grow a phal down here is in a chunky bark mix in a wood basket or clay pot. If you decide to repot, that is an option.