I am using a nord rpm 40 with a 0.6 coil...I like the wattage at between 7 to 10. .I've gone to 15 but it gives me a bit of a cough..but someone said that might not be good for the coil...I have used the 0.4 but find, even at low wattage it spits and I get the juice on my lips..yuck lol..this doesn't occur with the 0.6. I dont want to damage it tho by using too low of a wattage . any advice? new vaper here so appreciate any info.