I think the people who are running into the rattlesnake sound like Phil did are trying to run it like they did the dna40 and set the joules all the way and adjust temp to suit preference. That works pretty well on a dna40, but I think the sx350j is better suited to set a max temp and then adjust joules. I've never run into a rattlesnake sound doing it this way, even when I run my wick almost completely dry.
(note: I have no science to back this up, just my own observations and talking to other owners)