Surely a reading after the meal doesn't inform you a whole lot without the reading premeal..other than to let you know if it's a bit high or a bit low? If you are looking to learn about the impact of foods, before and after are the only effective way to tell.
My readings for over a week have all been 5.5 or below two hours after the evening meal, yesterday it was 6.5. That has told me something has change and I need to find out what. By only doing 1 reading a day, I have test strips left from the 2 per day the question allowed, I can now use these strips to find out what is going on.
I think it was two ice-creams over the weekend that "fill up the space in my liver", today's reading is 5.7 so it seems to be getting back on track.
The problem is that a meal has to be "very bad" to have much effect on the post meal reading, but can make other meal have more effect by reducing the "buffer", hence testing before and after each meal does not tell me much.
(I have cut out all the easy carbs and aim to keep doing so until I have lost a lot of weight, hence I am no longer BG driven on what I eat.)