A couple of suggestions that may work to allieviate the hard draw:
if you look into the atty, there are 2 slits on the sides of the needle plate and on the cartridge there are 2 flat sides - line up the cartridge flat sides to fit inside the atty with the 2 slits. The slits on the needle plate is where the vaper comes up and futher goes into the cartridge at the "top" of the flat parts. Or alternatively just pull up the cartridge about 1mm after sliding in to the bottom of the atty
The cartridge mouth end may be removeable with a paper clip and there may be another removeable flat piece inside - remove that inside piece and replace the end piece which should loosen up the draw by eliminating the extra small hole vaper travels
through.