I have never used a factory build atomizer, but have seen from removal that the coils are usually uneven, too much slack or too tight.
you might want to hop on youtube or search here on how to rebuild the atomizer.
with that said on my protanks, I get dry hits every so often. I have also have a anyvape BCC which uses protank and evod atomizers which has never given me a dry hit. I also recently bought a bunch of x9 protank clones that have never given me a dry hit. I like my clones better than my protank, but they look similar.