I love that the airflow adjustment can happen with just a turn of the tip (even though it's just using my own tip). It's got some good qualities, obviously, but the draw is not good to me and even though it's just the first build, I can't see what I could do differently with this build. I don't think it's the build to be honest.
I don't see anything wrong with your build so I would say try playing with the height of your coils. I run mine towards the top of the posts. I also forgot that some folks like to exhale before they inhale, I doubt that's a good idea with the Thump due to the air holes. I run a standard length drip tip & have a beard with no problems but don't exhale before the inhale. It's almost a shame that the Stumpy has ruined most of us for other atty's because it just flat out works, almost makes everything pale in comparison.
I'm real curious to hear your thoughts on the Evolve, I like it but it ain't no Stumpy either!