Are you doing low carb primarily?  Same thing happens to me when I’m doing low carb/keto.  Try looking up the “dawning phenomenon”.  When I track my highest readings are first thing in the morning (anywhere between 94-111 and my a1c was 5.1 when last tested) and they go down progressively as the day goes by.  I am going to ask my doctor for metformin to try for ninety days. I have been back in the gym the last few weeks lifting heavy and came off keto for a few weeks and want to test keto with my workouts.  Just having fun doing the experiment.  Why not, right?

do you have an a1c for 2018 yet?

i wanted a meter that tests both glucose and ketone levels so,went with the precision xtra.  I started running some tests every 4 hours for glucose to check during the day then started testing prior to my main meal then 1, 2, 3 and 4 hours post to see how meals affected my sugars based on those meals.  I was getting down to low 60’s with no hypoglycemic symptoms.

I think one one of the big takeaways with your a1c with a reduction of 1.1 you have made remarkable progress which is telling me your sugars are more controlled and your diet, excercise regimen and trt protocol seem to be doing their job.  I would be very interested to see what your results are throughout your day once you choose a meter right for you.