I going to stick with my original guess, you're producing ketones (based on your carb level) but your body is still learning to use them. Be patient. Dr. A talks about not exercising at all in the first few weeks of induction for this reason.

BTW, go ahead and try ketostix, but if you never get purple, that doesn't mean anything. I never got more than a pinkish color. A blood ketone meter is much more accurate....and MUCH more expensive.

Goog