If the KF was too tight then this is a tough question for me to answer. The air flow will still be fantastic for 99% of the buyers. The hard core lung hitters may find issue, seems they always do

.
As I mentioned elsewhere the airflow on the Heron is fantastic and needs more publicity.
It is an easy lung hit for me but, I don't need to lung hit as that mutes flavor.
Flavor is the highlight of the Spheroid/Heron atomizers.
GP did a fantastic job with the air adjustment, amazing. Mine is set on two open holes and provides a great medium to full for me.
I think you will appreciate and love the Heron for the craftsmanship, vapor production, build variation, flavor and air flow.