I've not had to use Noalox on any of my other Poldiacs, but I have tried it on this one, to no avail. I really don't know what to do with this thing, but perhaps send it back asking for a refund. I've written VaporAuthority about it.
Probably a dumb question but have you tried more than one atty on it, or tried the atty on another mod? The nice thing about mechs is as long as there is conductivity, there's vape. Your conductivity is being interrupted at some point. (I know you know this, just thinking out loud).
The only options are positive pin to small screw, small screw to lg screw, screw to firing pin, back through the bottom set of contact screws, spring to bottom cap, bottom cap to battery tube, battery tube to switch housing, switch housing to top cap, top cap to 510 threading. The issue has to be either one, or more, of those contact points or the battery or atty.
I used to noalox each of the above contact surfaces (very lightly) each time I cleaned the switch. The spring, where it sits into the bottom cap, can cause an issue if it isn't seated well.