Paphiopedilum tonsum possible issues?

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I don't have this species, but I have a smattering from different sections, plus hybrids, almost all unbloomed seedlings. Most are in S/H, some for almost 2 years, and seem happy. They are growing slowly. This is my first-ever venture into Paphs so I have no idea how fast they are supposed to grow.

Mine don't seem to mind spells of 40% humidity. Have you considered watering more often? In lower humidity the water may not stay as high in the LECA as we might like. Limp leaves sure sounds like they want more water, and it's not harmful to water every day in S/H.