Bolus feeds and calories

We've had some success recently with bolus feeds (one large feeding as opposed to continuous drip) after adjusting the calories.  It seems that Auggie has a hard time with high calorie formula. I've been giving him breastmilk (20 cal/oz.) and 20 cal/oz. formula bolus and he has not vomitted.  I guess some babies just have a hard time processing rich food.  When he gets breastmilk via the tube his mood changes dramatically - he seems happier and full of energy. We give him about 50-60ml bolus in 30 minutes.  The bolus feeds are important because they will help his stomach stretch and prepare for "real" meals in the future.