Just got this in and it's my first vv/vw. I have several tanks ranging from 1.5 to 2.4 ohms. If I set the wattage for 8 will the voltage change automatically? When I swap tanks with different resistance will it change then also? That is what i read before I ordered but when I go into the setting the voltage hasn't changed. Am I doing something wrong? I have been going into the setting and changing the voltage manually.