I did find a old RDA that it seems to like better. I've got it running on that atomizer now. Running a single 0.6 316L Stainless coil on a very tight IGO-W draw, 200C, 20W. Silky smooth.
Thanks again Betty. Looks like these are just fussy 510s. Strange Joyetech hasn't figured out a good spring-loaded center pin after all these years.