Do i split the dose ?

Hi you do not say what your high/low levels are also do your meals vary from high carb or low carb also if your excersise varies all variants of these will affect your levels.You probably know the ideal bm reading is between 5 and 7 so if your levels rise or fall dramatically outside these limits you may need to speak to a dieticion or visit your diabetic clinic to see if you need to change your insulin type or dosage.
I have been T1 for thirty years and now regulated my dosage according to my diet and excersize.
regards Alan.

Possibilities that come to mind.(you are on a pump? your profile says both pump and MDI but I found a post saying you were about to go on one)
For the meal, it might be that like many of us the meal is larger than earlier in the day and takes a bit longer to absorb. It may not completely contain just low gi foods but the overall composition of many mixed meals can be quite low. The insulin acts rapidly before all the food is absorbed
You could experiment with a dual wave bolus (where you give some insulin up front and the rest over a set period of time or a square wave where it is all delivered over a set period...different punps have different names) I read somewhere that one of the US pump gurus (Scheiner I think) says that dual waves should be used for almost all boluses
It could also be that you need a slightly higher basal later in the evening, you would need to do a basal test to find that out.