Yes, it may be that the meal doses are making up a basal shortfall. So if basal is increased, reduce bolus and test what happens. There is a possible problem in the fact your basal is spot on for overnight, morning and afternoon. If that is the case, by fixing one part of the day in the evening, causes problems in the other 3 parts of the day, night, morning and noon, in which case you would be better to give a extra meal bolus maybe one hour after evening meal to make up basal shortfall of the evening only. Would strongly advise testing all basals to better understand what's happening and then decide what to do. I used to have this problem on mdi, now pumping so can set different basal profiles different parts of the day/night to keep a flatter basal profile without needing extra injections .