Cannot alter MBP Power Management Settings I've got this problem where I can't alter some pmset values in Terminal. 
I can change them, the changes are registered with pmset -g, but they are ignored. 

Example:

pmset acwake 0


but Mac still wakes if unplugged.

pmset hibernatemode 0


but it still hibernates after a few hours of sleep.

I've reset PRAM and NVRAM. I've switched off SIP. I've moved on to pulling my hair out.

Any advice in terms of solutions or diagnostic options would be greatly appreciated. 

Late 2012 13"MBP
2.9 GHz i7
OSX10.13.2
2 TB Crucial SSD
16 Gb RAM
I identified a serious problem between power management and sleep states management
in version 10.13.4 of MacOS X (I had regular crashes on sleep and hibernate exit: around 5 times a day, and files modifications lost).
I thoroughly tested 10.3.5 and Apple seems to have fixed many problems.
standby 1 isn't anymore causing a crash on encrypted filesystem on hybernate exit and on sleep exit,
acwake 0 is working as expected.
But lidwake 0 is still not working, thus potentially causing the MacBook Pro overheating in a bag around the lower part of the screen and the upper part of the keyboard.
The DestroyFVKeyOnStandby 1 isn't yet in the documentation and causes a crash on hibernate exit.
The documentation (man pmset) isn't appropriate for the pmset command:

some options aren't documented,
others aren't behaving as documented.

pmset -g pslog is pretty useful to understand this behaviour which is changed without notice and without documentation.
I advise you to download MacOS X 10.13.5 combo update
Now I recovered a MacBook Pro I could use to work.
NB: I didn't tested 10.13.0..3 nor 10.13.6 nor 10.14.... (nothing needed, not yet a free dayfull of work to waste on tests, and no time to spend for an editor who doesn't make a correct documentation).