@Peter_Hoatson Welcome to the forum!
Your description of your experience is a bit surprising. Many folks (myself included) have experienced the opposite of what you’ve described when starting up on serious carb-restriction - and then seek ways to “loosen things up” (e.g., magnesium citrate, other salt adjustments).
It’s possible you might be overdoing the fat, perhaps, but the fact that this has been going on for months and by now your mitochondria are likely fat-adapted (and more fully utilizing what you’re eating), and that you’re eating only to satiety would suggest to me that you’re not likely overdoing fat consumption to meet your body’s energy needs.
Plus the fact that your energy level, mental clarity and lack of pain/inflammation or discomfort are where you’ve described also suggest that “all is well” … all but(t) your dissatisfaction with your bowel movements.
If anything else were amiss, I’d encourage you to start messing around with potential solutions. But I’m more inclined, given your situation, to encourage you to stay the course and give things more time to settle down.
Between gut biome, dietary fiber, salt intake - all of which affect us on a very individual basis, and some not at all - I’d read up on such possibilities as a learning exercise, but refrain from actually pulling the trigger on any of them at this early stage.
So that’s some totally free (and overpriced) internet advice from a stranger. 