This won't help OP, but for those who get weak vapor/hard draw:
I've had autos, both PT and battery, get a little off due to not-so-obvious gunk buildup. Common is for the air inlets below the threaded connector, or the channel between the threaded part and the center post, to build up a little gunk, which may not be obvious just looking at the top of the center post.
Put rubbing alcohol into the alcohol bottle's cap, put the battery connector end into the cap with alcohol for a few minutes, then wipe it. You just want enough alcohol to fully cover the connector end, not the main battery compartment.
Keeping it upside down, so any alcohol that got into the center hole can continue draining, poke a thumbtack through the air inlets on the side of the connector, then run the tack's tip around the interior wall between the threaded outside connector part and the center post section. Final step is run a little folded paper towel in that gap between the outer edge and the center post.
Give it a few minutes for any residual alcohol that is in the connector to drain/evaporate, then try it out on a clean carto.
Just cleaned an auto PT and battery this am, they're both happy vapor-producers again, much lighter draw.