I pretty much recommend 510's to anyone starting out now, sure the flavour isn't quite as good as a 901 but throat hit and vapour more than make up for that as well consistency of the atomizers, mainly I'm sure due to the threads which help with wicking. If I take the length of drags on my 510 as you did in the video you wouldn't be able to see me for smog so its definitely bad atomizers. They sometimes take some teasing to get going but once its worn in there's no beating them. I'd suggest dripping three or four drops directly onto the atty with no filler in the cart and see how it performs, just to exclude cartridge problems.