Your Paph is still in good shape.
Brandon Tam at the Huntington gives the slipper genera 10 parts per million of nitrogen at every watering. That is a lot less than most people give other genera. You can read lecture notes of his talk if you use the Search feature in the maroon menu above; click Advanced, then search term DVOS and my partial username estaci .
I read about S/H and about fertilizing in great detail on the First Rays Web site, run by OB member Ray. I strongly recommend people who want to grow in S/H to go there. It's also the place to learn about fertilizing.
In my opinion Catts and Dens do better with more nitrogen than Paphs prefer. Not much fertilizer is needed during cool weather, and most Dens are better with no fall-winter fertilizer. But the warmer the summer, the more nitrogen they can use. Ray suggests using 25-75 parts per million nitrogen with every watering. In my very warm sunroom I've found they grow faster with even more summer nitrogen.
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