[neoflex]

As others mentioned I would look at your hygrometers first and foremost especially since when re-seasoning your not seeing an improvement.
My little trick when re-seasoning is taking a small bowl of distilled water and warm it up in the microwave for a couple minutes. Carefully place the bowl in the empty (of course)humidor and keep it closed for a week. I find the warmer water spikes the box out of the gate and gets it to hold steady faster.