The 306 atty looks perfect. Cignot has them and they work on a 501 battery, so I think I'll pick up a few and give 'em a try.
I love cartos for liquids I'm sure I like, but I'd rather not waste them, or deal with cleaning, when I want to sample new stuff. Regular carts are a PITA and messy, therefore dripping seems the way to go for this particular purpose.
I just went ahead and pulled off my drip tip and seem to be having more success with a bare naked atty. I suppose I could drip and put the tip back on if it gets too hot.