Well you've certainly jumped in the deep end. We need to know what resistance the coil is, and what voltage/wattage you are trying.
The Protank will produce heaps more vapour than a cigalike, but you have to run it at the Kanger recommended settings and let it do its thing. It may take between 1 and 2 mls for the coil to "run in". You just have to be a little gentle with it. Burning the coil early on can have a bad effect on how well it works.
I would swap the head out since it seems you've had some dry hits (the burny-hurty stuff) and take your time with running it in. Have a look at this blog and see if it helps at all:
http://www.e-cigarette-forum.com/forum/blogs/fabricator4/5045-bottom-coil-clearomizers.html
Hmmm, third time I've posted that link today...