I have force air gas heat with Aprilaire humidifier attached. I set the humidifier to the highest level hoping to make the house as humid as possible. Humidity level kept fluctuating between 30 and 35% using 2 different humidity gages. I changed the filter on the humidifier. I made sure that the filter is getting the maximum amount of water. Still, never been able to exceed 35%. Please let me know what else to try.