Atty Question

I thoroughly enjoy my eFox cig, haven't had a cigarette since the middle of November. Since then I've purchased several atomizers for spares, and noticed the draw is inconsistent even from the same supplier. With one I'll get good vapor and throat hit, then the next atomizer will be hard to draw on and deliver very little vapor.

I've tried cleaning them in both vodka and coke, a couple of cartridge fill modifications I've found on line, still no difference. Are there inconsistencies in manufacture, or am I missing a step when starting to use a new atomizer?

I'm having the same problem with my atty that came with my efox. Sometimes it works great and others I think I'm going to swallow my cig.