It is great to hear that people have had no problems at all with theirs like you have , especially as you have 3 of them.I have three of them (one of which is the white delrin) and i've experienced no problems so far.Admittedly i only use stock coils Aspire 0.80 mesh or Smok Nord's.
I think the fact I couldn't get mine to register in its simplest form with the Nautilus adaptor and what happened with the first one really made me have, rightly or wrongly, no confidence in it all. Plus the fact that both the Cthulhu tank with the coil adaptor and another Boro tank with similar adaptor wouldn't work in the Cthulhu at all, but both registered and fired in another mod. I guess just have to put it down to very bad luck !!