Usually 10g of carbs for me rise 45-50 mg/DL but it depends on the time of day - in the morning I get more sensitive to carbs then in the late afternoon (8g x 12g or something like that).
You can try out some foods because there's also the difference between the body's absorption to the kind of food your eating - for example, one large spoon of white rice gets absorbed a lot faster then and one of sweet potatoes.
For me, the best thing I thought to fix this problem was going low carb so usually I don't have to take any insulin for meals, or max 1 unit of fast acting insulin.
But you can try to eat one slice of bread, with a normal pre meal BG, and not taking any insulin - then, you can check the BG the next 30'/1h and 2h to see what happens. Then the next day, at approximately the same time, eat the same slice of bread (let's say it has 15g of carbs) and take 1u of fast acting insulin and do the same thing as before (measure it 30'/1h/2h later) and check if the dosage you used was enough to lower the post meal BG to the same level as it was before.
Just a suggestion, but I hope it helps!
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