How are you testing your ketones? Urine (Acetoacetate), blood (BHB) or breath (acetone)?
Blood and Breath are the accurate tests. I just got the Ketonix 2015 in the mail today.. trying it out now. It's really close to the blood BHB value.. linear correlation (allegedly).
e.g. my blood read 1.4 mmol/L just now. My ketonix 2015 read about 1.25 mmol/L and my urine read 4 mmol/L.
Once keto-adapted.. my urine might read like .5 mmol/L but blood/breath reads 2.5 mmol/L for example.
I recommend the book Keto Clarity by Jimmy Moore.. just finished reading it.. love the book. Learned a lot from it.