It could be that the Khasianna and Truncata just have not acclimatized yet. They were rooted cuttings that I planted 2-3 months ago. The Coccinea was a well established plant, 18" across with two growth points. It has produced 4 pitchers in the 2-3 months that I have had it.
I measure the humidity with an Omega brand digital pocket hygrometer. It's very handy and responds quickly. It is interesting to find so many 'microclimes' around the house and yard. Location really does make a difference.
I have an Ampullaria that just sat idle for 3-4 months, then all of a sudden, out popped 4 large pitchers and it hasn't stopped since. Course, that's in a terrarium under 100w metal halide in 80-100% humidity.
I would still prefer to grow Nepenthes out in a room.