Do you use your meter to show you what your food choices do to your levels? It may show you at a glance that porridge isn't a good choice. It is very high in carbs, and worse if made with milk. Do you make your own soups? What do you put in them? Hummus can also be very high carb.
I suggest you try testing immediately before you eat and 2 hours after first bite. Keep a detailed food diary including portion sizes, and record your levels alongside the food. Look at the rise, if any, from before to after eating. If this is 2mmol/l or more there were too many carbs in that meal. You can soon see patterns emerging and see which your danger foods are, so you can either seriously reduce the portion sizes or eliminate some of them.
If you feel tired or hungry, which is normal when you seriously reduce carbs because you are losing a source of energy that needs replacing, add some good fats to your meals, fats such as avocado, olive oil, real mayo, butter, cheese, full fat yogurts, cheese, nuts, as these will replace the lost energy..
You will feel so much better if you can get those high blood glucose levels down.