Hmm I don't have a problem. The main thing is use it like a pixie diffuse up there. Position then switch on. Turn off to remove. And DON'T Move it around. Give it time. I hold it in place 1 to two min. Also I switch out to bowl diffuser for length and go back to it to touch up root scalp area and do the palm out thing on length after curls are set by bowl diffuse. I think you'll just have to experiment to see how it works best for you. But stillness is key. You can great root volume from it though.
2a medium porous, You can see my wavy tutorials here: and my wavy blog is The Wavy Nation