How long have you been diagnosed? Only it takes approx 3 weeks for metformin to build up in your system to do its stuff properly.
If you've had longer than 3 weeks then something definitely needs increasing because apart from brekkie you appear to have had very few carbohydrates today. There would be some in the pastry round the quiche, unless it was crustless of course - but none at all in a crab salad.
So from what you've said and of course I don't know you and ain't medically qualified - maybe you'd benefit by adding a gliclazide (that's a drug which stimulates the pancreas to produce insulin) with meals containing carbs or even a mealtime, fast-acting insulin.
However to actually see what food (anything) is doing to your BG, you really need to test both before and after the meal. So was the 5 when you got up? and then the others were - when in relation to the meals?
Here is a link to the numbers you need to be aiming for at this stage
http://www.diabetes.org.uk/Guide-to-diabetes/Monitoring/Blood_glucose/Blood_glucose_targets/
Multiply those figures by 18 to convert them from mmol/L which we use in UK, to mg/dL used elsewhere. So 4.0 mmol/L = 72 mg/dL and so forth.
How old are you, are they certain you are T2?