Aprilaire 600 humidity level too low

Question

I can't get my humidity above 31%. I have the control all the way up to 7 and I can see water flowing. What is the problem?

I have a "General" brand humidifier. Power humidifier on the warm air side and I still cannot get the humidity above 30%. Our house is small 1000sq ft. Brand new 2 stage variable stage blower furnace.