Debs
Just noticed your discription of the different bolus's avaiable on the pump, and you may be miss-understanding how the mulit-wave delivers the insulin..
The mulit-wave is a combination of the standard bolus and the square (timed) bolus, when you choose the amounts for the two wave's there isn't a time delay between the two deliveries.. The first amount chosen, will be delivered as a standard bolus, the remaining amount, will then be delivered as a sqaure waved bolus, over the period that you have chosen, it starts the square wave delivery as soon as it's finished delivering the the first part... No time delay apart..
If you check your screen and follow what happening, then you will see that the first part is deliverd, and then you are left with the remaining amount showing, with the time you've chosen for it to be delivered, as this goes by, the amount left slowly drops over this period...
Hope this explination explains, and it helps you with sorting out your bolus, if you working on the theory that the multi-wave is delivering a straight 3u to start, then waiting a chosen 45 minutes, the delivers a straight 3u then this could be why you'll getting your calculation out with some of your foods..