I hear you! Microsoft has been moving away from the granularity of power profiles in the past, and is moving to replace all of that with the power slider when clicking on the battery. Basically if you click on the battery and you put the slider all the way to left, this is the absolute most power efficient setting you can use.
There are nearly infinite ways to drill down further, but for most applications the built in battery slider is good enough. Because there are just so many different avenues to accomplish that, the quick piece of advice I can give you is that it has to do with the registry. (Which you need to be careful with, as you can bork your install.)
Outside of registry hacks, here is a program I discovered that works well with the Framemwork chipset:
On a side note, if you want to see truly phenomenal battery life try using a tiling manager like Sway instead of Gnome. (KDE is supposed to also be super power efficient)