Hi
@palm_tree, From my experience as a T1D, and not as professional advice or opinion.
1) Does your C/I ratio of 1:1 apply for all meals? With use of my insulin pump my ratios are different between morning and evening meals.
2) What type of carbs do you eat? If your carbs are the type that are absorbed quickly you may need more bolus (short-acting) insulin to deal with the high rise BSL compared to lower GI/GL carbs (please see mendosa.com, GI, GL definitions and Glycaemic Values for an explanation). Basically not all carbs are created equal.
3) Levemir is reputed to last 12 to 16 hours, sometimes stretching to 24 hours - so it may be that your basal insulin is running out and so one meal time eaten in the hours before the next daily shot of Levemir might require more short-acting compared to another time of day.. Many of us take Levemir twice daily to avoid this problem.
Of course please discuss 1) and 2) with your DN or doctor before making any alterations.
Best Wishes and please let us know how things go !!