I'm finding a 1.3 ohm coil to be to low for me. On my Provari, between 2.9 and 3.5 volts are OK. I haven't used this tank on either of my other two variable wattage regs, but I'd think it to be in the 6 - 7 watt range. It's time to re-wick the other tank or quit typing and do it already. I think I'd go for the former, but then I'd have to think about that. The other tank's coil I wrapped to about 1.7 ohms. My mech and me would be ever so gladder if that tank was fully operational again.