I agree. Your mod is a fixed single voltage/wattage mod. You'd be better off getting a variable wattage regulated mod so that you can adjust your vape "on the fly".
The only way to change your vape with your current mod, which is essentually a mechanical mod with some protection circuitry, is to change your coil resistance that you use. Wouldn't it be much easier to have a regulated variable power mod and change the power output and it wouldn't matter what coil or tank that you're using?
With an unregulated mod like yours, the power output drops as the battery voltage drops. So your vape will strongest with a fully charge battery, and become weaker as the battery drains.
A regulated mod has a chipset which regulates the power output to remain steady to the power (wattage) you set regardless of the charge left in the battery. Your last puff will be the same as your first.