It seems to me that your lo is getting plenty of milk. He would not be happy otherwise. Please remember that your baby is far more efficient than the pump will ever be. The only thing I would suggest, if you are concerned about his milk intake, would be to switch the solids and milk feedings so that the milk is before the solids (8/8:30 milk then solids at 9/9:30 and 12/12:30 milk then 1:30 solids).
HTH, you are doing a great job! Don't let the pump doubt your supply