Humidity into a grow space

[Willisbrow]

I just picked up a sonic ultrasonic humidifier that holds about 4 gallons. I have it running at like 90% RH and my room barley cracks 50%. I have an oil heater that heats my room to the low 80s but I m can’t seem to get my Rh very high. I tried running my exhaust fan at a low speed when the lights are on so that it heats up my room. But my RH is stilll kinda on the low side. Here is a pic of the data chart I just took

 

[Willisbrow]

I guess I just gotta mess around with the controls aans try to find a asset spot. My room is a mess and maybe whe. I get it fullly filled with plants I should have a higher RH