I created a ticket, but to be sure it's seen making a post here.
After a deploying a Pet w/Karfi sans doffs my systems power will go to max when a couple seconds of 2 tics. In otherwords after the 1st second there's a massive spike to systems power, after the 2nd second there's a another tic where all subsystems are maxed out.
Others mentioned this happends when deploying mines as well, I haven't tested it though.
Also, the gain was noticed when I did equip doffs as well. I just don't think doffs are the cause.