is that caused by too much solution/water or not enough...when i leave the top up for a while the hum comes down a little??

To much water. Add some soultion and use less water. You can also take you humidifer out for a day. That sould drop the RH.

mm

Use the beads--they regulate better

Take out your humidfier, you don't want it to mold. Don't use to much of what ever your using, water/solution, start out light. For now just let some of it evaporate and then put it back in.