stop worrying about raising humidity, please.
my clones root in 35%-80% rh, 65-80f, no leaf mutilation, no heat mats, no misters.
water cubes when no longer moist to the touch.
put a meter inside the dome and stop guessing rh if you feel the need to know.
the longer you keep feeding leaves water..... the longer it takes for roots to seek the moisture.
leaf wounds, high humidity, high heat= mold, brace yourself
you're at the easiest stage, the very beginning of cultivation. your cuts look good. I imagine the thousands of questions and issues that could be answered and solved after reading one grow bible, even before your next step in growing. while you're waiting for these to root make a check list.
There is no question...you will need an air conditioner, dehumidifier, hid lights, fans, air scrubbers, timers, ph/ppm meter to avoid major garden issues.
best wishes