Just gone back and checked, and every time @Linagirl has one of the big spikes, the bg drops lower after, than it was before. Classic RH - just like me. And that is on a well controlled LC eating pattern. It would be MUCH worse if she was eating carbs - if she is like me in that too. 
Oh, and your flatlines, @Andrew Colvin may be from gluconeogenesis, rather than from carbs.

Oh, and your flatlines, @Andrew Colvin may be from gluconeogenesis, rather than from carbs.