Something I just found out that has helped me immensely with both my KFL+ and my R91 is tightening up the air flow. For a long time, I was
vaping them both wide open (and got nice big billows, which is what I was after

) but I was getting the dry hits described by the OP. Tightening the draw about halfway cured the dry hits, and while vapor fell off a little, it wasn't much and I got a boost in flavor to make up for it. Until I listened to one of Todd's
reviews where he explained how vacuum tanks (like the KFL+ and the R91) actually work, I didn't realize that when you tighten the draw, you are pulling more liquid into the chamber, thus eliminating dry hits. OTOH, if you're getting gurgling and flooding, loosen the draw and it goes away. Air flow control is a lot more important than I ever knew ...
