I would definitely recommend picking up a cheap multimeter. Someone on this forum said a multimeter for a vaper is like a stethoscope for a doctor. I couldn't agree more.
I would check the resistance on the atty. If its not in range, then the atty is bad. If it's all looking good, I would try another atty to make sure its not something with my battery.
Finally, a lot of people with 510 atty's have had success removing the bridge & wick from their atty's for more performance (Don't do this if you're using a filler cartridges, this option is really only for drippers). Might wanna check into it

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