badgerbeek, i would also be checking the queens progress. eggs, and larvae. one egg per cell, not multiple eggs, and not eggs or mulitple eggs laying on the sides of the cells. good solid brood pattern, if it's not, let us know what you see or post pics.
if they are taking more of the pollen patty, that's fine, indication of a shortage of pollen. they need pollen, or a pollen sub to raise the brood.
ef already covered how to check for mites......good luck, and keep us posted!