I have this issue cutting my own hair which is super fine. A couple of things occur to me, when you're sectioning the hair, you need to be pulling up pretty small sections with the comb. Then you hold this little section of hair between two fingers, away from the head. Apologies for the poor description, but at this point you should have a layer of hair evenly distributed between the fingers, not a clump. I also do most of my sectioning in one direction, then when I've cut all of that I pick up sections perpendicular to it and level out any bits that are not neat.
And if that explanation made any sense to you, you'll have no issue at all with that hair! Sorry, but it's the best I can do for an explanation.