@Job76 I wonder if the high blood sugars after breakfast could be related to dawn Phenomenon/Foot on the Floor where our liers helpfully dump a load of glucose into our blood to give us energy to start the day.
Due to this, some of find we are more insulin resistant first thing so need to pre-bolus earlier and may need a different insulin to carb ratio.
It is easy to tell if your need to adjust your timing (pre-bolus earlier): if your levels spike and then come down without any additional insulin, it is likely that you just need to inject earlier relative to your breakfast.
If your levels go up and stay there, you are likely to need more insulin.
The other thing to consider is when you take your basal insulin. If you take your basal in the morning, it could be that it is running out before 24 hours. I found Lantus lasts for 22 hours for me.