several coils have come out defective and burn out instantly on first use. That's mainly why I switched back to the old atomizer.

I use the geek vape z max, I had no contact with geek vape until now and I probably made a mistake buying the Zeus sub ohm, I got the 0.14 that I put in the z max, at 60 watts I have flavor, I have vapor but many leaks that come into my mouth and reminded me of resistances that existed 10 years ago, I do not recommend it.

I put the 0.15Ω in the Geekvape Z Sub-ohm Tank with 70/30 liquid and it works perfectly, with excellent draw and very good flavor.
Set at 90W, which is its limit, it is a bit tight and you don't enjoy it as much, but anything between 70-85 performs exceptionally well, producing thick vapor and giving a very good flavor.
It is a good alternative to the 0.2Ω, which you have to operate at max 70 to enjoy vaping, with 60 being very comfortable!

Edit: As for the 0.40Ω, when you have experienced the draw, flavor, and "cloud" of the 0.15/0.20Ω, you don't go there. Everything is inferior without enjoying something more.