help me with vtwo mini + cubis tank

İ have my brandnew Joyetech evic vtwo mini with cubis pro tank..

I really love my mod, but i have a big spitback problem, my lips had burn several times with liquid.. I am using ss316 0.5ohm with settings ;Temp SS316, 280C, 18watts

Are the settings ok or my tank is not working well..

Pleasee help me???