I've had a similar issue when switching tanks. It seems like when you fire the mod for the first time it saves the settings it used for that particular coil in order to avoid having to check the ohm value on the next fire, thus decreasing the time to load. If you don't select "y" when you switch to a different ohm value setup and it asks you if it's a new coil it tries to fire as if it was the same coil as the last one. So for example, I've got a 0.6 ohm tank for mtl/restricted lung hits, a 0.2 Cleito aspire for one flavour and a 0.15 baby beast for another flavour on rotation. If I switch from the 0.6 to the 0.15 and select "n" when it asks me if it's a new coil it gives me an error, because it's not asking if it's new as in unused, it's asking if it should use the same settings as last time I fired it. The error is "don't abuse protects" although I have seen the "ohms too low" in the same situation before.
Thus, taking the tank off, replacing it and telling the Alien it's a new coil fixes the issue.
TL;DR: Try taking the tank off, putting it back on and answering "y" to "new coil?".
If that doesn't work let us know, I'm sure we can figure it out!