It could be, like Rhaps indicated, high VG juice that can cause clogging and tight draw (?).
All i know is the draw after a week will be just slightly airy... vs hh357 901 which is even airier.
But overall it is such a smooth vape I have 3 of them working 2 bottom feeders (Reo Grand and XL Vmod) and they are the best I've found short of the HH357.
Being that they are designed similar to Hanna's in appearance, I assume that's why the vape of this 1.5 Ohm is not hot like a Cisco spec 1.5.
All i know is the draw after a week will be just slightly airy... vs hh357 901 which is even airier.
But overall it is such a smooth vape I have 3 of them working 2 bottom feeders (Reo Grand and XL Vmod) and they are the best I've found short of the HH357.
Being that they are designed similar to Hanna's in appearance, I assume that's why the vape of this 1.5 Ohm is not hot like a Cisco spec 1.5.