I ask this because i have a uwell crown sitting on a evic vtc mini. uwell used d grade wire which i'm assuming is good for normal power, but i found in temp it's good for a couple of weeks then it gets funny tasting and dry hits and or burns up easily. I've been told L grade wire is better for temp but i don't know. I would like to try titanium one day and see the difference. i like the nickel coil but it doesn't last long three to four weeks tops. What would you recommend for wire, attie, rta or rda.