I have same issue with high ketones. Constantly above 4+ mmol if I’m ~keto carb (10-20g). Also they just go off the measuring range (8mmol) after 2 days of fasting or prolonged very low carb. I see my hypoglycemia symptoms appear BG values between 2.3-2.7 mmol (41.4 - 48.6).
I haven’t measured it from the blood with ~high carb tactic, but at least Ketonix plummets down when eating more carbs, more quickly if it’s more juicy carbs. So I guess my insulin production is somewhat still working.
I also have weird values from the moment I started keto (3 years ago). I wish I would have measured before the day when I started as I was on ~0% added fat, the only fat coming from meat, with just about half fruits and half green leafy vegetables for about a year. This also showed up on first yearly control (fasting BG at 7.0mmol). No one had any clue how to direct me, because “I was eating healthy”, so I found about keto and started on it. After first day of keto: BG 3.7 mmol (67) and ketones 5.9 mmol. And the values haven’t really changed. Joint pains (especially in fingers) vanished within a week (was a problem for a ~decade), so never going back to constant high processed carbs.
No idea if I’m fat adapted, but the more ketones are in my blood, the worse I feel. I tried multi day water + electrolyte fasting and had to stop after 4 days because of internal chills started appearing. Maybe because even thou I have ~25% fat, my absolute fat weight is very low and those fat cells can’t churn out energy fast enough. Although why are my blood ketones sky-high then? Not able to being used?
So far on this modified 5:2 (what Mercola is talking about in KetoFast) my gut feels way better as I can finally fast periodically without symptoms (out side of gut symptoms, gut always felt good while fasting). So for me it might be that I need to cycle the macros. Also I’m pretty sure I have been destroying my gut for a ~decade before going keto.
Sadly I have never seen any mentions about this issue on any source. Also this is my first time ever discovering someone else having this “problem”!