I'm stuck at why you say 45w is as low as it will go. It will adjust 1w ~ 100w.
Sounds like you're trying to adjust both modes, at the same time.
Just set temp, don't even look at the watt setting.
I wouldn't put much faith in youtubers, the 3 I tried to use came with low quality batteries and seemed to fire way hot, like it didn't/couldn't down regulate.
I'd say yours is probably working fine if it isn't scorching / burning the nautilus.
Best to try a different temp control delivery device on it if you want to use the temp control. The one it comes with is so so.