Humidity needed for 10x20

hey guys, I’ve been looking into options to raise the humidity in a 20x10 flower room with 10k watt of lights. I use a mini split to keep temps correct 73-83ish. I also run a co2 burner along with 2 6” carbon filters and 2” carbon filters strapped to the ceiling. My humidity is roughly around 50% lights off and mid 30s with lights on. I bought an AirCare 3.5gallon humidifier and the results have been very lack luster when on maxed out, maybe a 5% increase over all. Ideally I’d like to get my humidity in the 65% range since I’m perpetual. I’ve been looking at the ideal air 75 pint but I’m not sure if it’s enough to do much. Was considering getting 2 and putting them on each end of the room. What other options might I have?

Thanks in advance!

that's what i was going to suggest, get two and put one about 2/3 down one side, then the other one the same on the opposite side, not all the way at the end of the room, or you'll be humidifying walls. where the circles are, 5 feet out from each wall, would be the optimum spots. then if that's still not enough, one dead center of the room, too