Have you tried cleaning them out at all. When i first started vaping i think i flooded mine out on a few occasions. I have personally boil cleaned two of my atomizers when performance dropped off. I did wait till i had two new spares though, just in case.
After doing the boil thing, let them dry out overnight. Before i stried using them i added a couple of drops to the atomizer bridge and let it soak in for a while, added a few more, let it soak in. Put on a fresh cart and battery. Puffed away. It took 10 - 15 puffs to get them going. But right now i have 4 working atomizers.
I do blow mine out from the battery end and let them drain onto a paper towel every night. I've been using these atomizers for 5 weeks now.