Thanks, newbutt. In MHO also, I obviously can appear slightly on the mean/edgy side to noobies. For all you noobs out there, rest assured that I am really a nice guy. I post the way I do, calculatedly so, to grab the attention of the OP and to create focus on the initial problem(s)/question(s). As everyone knows, threads tend to wander. Not necessarily off topic, but wander they do. Too many great answers to the OPs question(s) go unnoticed because the sheer weight of responses are garbled with good and poor assessments, mixed in with good and poor advice.
The best advice I can give to 95% of the grievances with the 510 model is that nearly every single one - whether it's the taste, the burning cart, the leakage, the gurgling, the lack of consistant vapor, poor performance issues, etc - can all be directly related back to stuffing a cart correctly and successfully, using proper material, etc.. The stuffing/wick MUST fulfill it's mission, of not only holding the fluid, but transfering it to the atomizer at a desired rate of success. This, in and of itself, makes ALL the difference between a so-so pv (any 3 piece model) with issues, and a pv that rocks your socks off. I understand this because of trial and error. Stuffing a cart looks so easy, but it's an acquired skill that takes a lot of practice for the first few weeks/months of ownership. It should be done carefully with a fine attention to detail, and with the transference of liquid from the entire wick to the atomizer as the goal. Lumps, blockages, too tight, too loose, too much, too little, too long, too short, too thick, too thin - every conceivable detail, no matter how minute, must be addressed to create the cart for optimum performance. Once the perfect cart is created, properly filling it with ejuice becomes the next task. After cartbuilding becomes second nature, most all problems suddenly seem to vaporize along with a noob's favorite juice.
That is all.
EDIT -- Hope I sounded nicer.