If I were in your situation I would:

-Turn the vape UP to at least 320 (320 is the temp at which THC is activated, so thats probably why you dont feel anything)
-Poke a very small hole (about 1mm diameter) in the hose to add a little air to the smoke. If one isn't enough to make you stop coughing, try two holes.

Just don't poke too many holes or none of the vapor will make it up the hose. you might also want to cover the holes when you aren't hitting or you'll lose some vapor.

You could always try making your own edibles as well, its much much cheaper and pretty easy.

good luck!