I generally try to align the airflow to the coil dimension, and the airflow on this is pretty big, hence me using bigger coils, though I believe you guys if you state smaller is better in this case

I really like the draw, easy of build and filling and short-formfactor and leakproof. I have tried from 2.5mm to 3.5mm, but honestly can't remember if the smaller ID coils where better to me or not, though I remember I have never gotten as good stable wicking(TC) before. I use high-vg and take long lung-hits which makes perfect wicking tenfold important imho.
One thing i've noticed and sorry for off-topic, is dryburning SS316L makes it have an off taste to me, even though doing it very lightly as recommended. I needed to rebuilt afterwards, but then read you could just use water afterwards, or a brush, because else there's something sticking which gives it an ashy taste(after dryburning). Total noob to SS and TC here