Well there it is right there you found it:
you're not using a standard 'ecig' system; you are using 100% VG and according to your descriptions your are burning glycerine.
When you burn the glycerine it produces a strong pungent fume which will give you a strong throat hit; but that is not the stuff you want to be vaping
Building your own coils and adjusting your hardware is all about finding that sweet spot between zero and burn.
woops....sorry,i replied too your post.