Hi and welcome. I agree with
@Topwater Elvis . Make sure-- very, very sure-- the center pin on your limitless protrudes at least 1mm below the outer 510 threads; 2-3mm is better and safer. It's real easy to get a hard short at the battery top with one of those faux-hybrid
mods. If it does, though, it will be as safe as anything can be with one of that type
mod (I don't like them, in case this isn't clear). And yeah, that coil is probably too much heavy metal. With a one-battery tube, low coil mass helps it heat faster. Try a slick wire (round wire) coil in the .5 range. I suspect you'll see better results.