I tortured my present blooming plant for years starting as a wee seedling.
At first never getting much beyond 3-4-5 " across it would add a leaf - loose a leaf. Then add a growth - lose a growth, and all at a snails pace.
Then I cut the K and the plant turned into a normal Paph. Leaf span jumped to about about 8 inches, adding growths without loosing growths and bloomed.
I just posted the second blooming of this plant, and it continues to grow.
It's still in a 2 inch pot, and its been so long since repotted there's not much beside roots, spongerock and charcoal (any bark or chc is pretty much gone). A few times I spoon in a top dressing of shredded leaves from the front yard, but I don't know if that did anything.
I water daily with 5ppm N low K fert.
It's in the GH at the shadier end near the wet wall, but my GH is small so don't know if there is that much of microclimate difference for temps and humidity anyway. Winter low night temps about 60 and day Summer highs under 90F, when things are working normally.
I got a division of an emersonii from Leo a couple years ago. Been adding roots like crazy, but only moderate top growth action until recently. It's starting to add leaves and span at a better rate this spring.