Oh, and KF, I should add that you might benefit from a bit of hygene.

Not the personal kind! Rather, the vaping kind. I was finding some of my Boge LRs were not working as well as some others and after looking at them closely noticed a dark film on the threads on the cartos and both devices. A quick swabbing with a q-tip and Isopropyl and the connection area was nice and clean. It
believe it helped, but again, FWIW...