I must really be missing out on something by using pre made coils.. Every time I read you guys building coils, I never understood it.. but nothing is quite satisfying me for throat hit, even with high nic.
Do kayfuns and digiflavour sirens have better throat hit?
You mean that you're just using factory coils?
I rebuild those (see in my blog for Atlantis family, I have a link to the thread where I show how to rebuild them), and the rebuilds are 10x better than the factory ones.
But that said, I rebuild them for the tanks "on the go" where building a deck isn't feasible.
But more and more, I've been switching to RTAs, and the cartridge coil tanks have been sitting on my desk for quite a while, and same with my wife and daughter's tanks that since I've got them some RTAs (which of course, I'm the one that does the building for them), they barely ever touch these old tanks now.
So all this to say: yes, absolutely, between the factory coils/cartridge tanks and RTAs, it's a huge difference, a "next" level.
The learning curve is actually not that bad, but may consider it "scary" at first.
If you want more info, check my blog, I've done some instructions/guides for coils and wicking.