I don't see anything wrong with the flowers in the pictures posted. The ones that don't set fruit, and most of them won't, are just going to dry up and turn brown.
If the trees were just planted last week, twice a week for the first couple months is sufficient, once a week thereafter until about a year out and the trees are established. After that, just during drought periods (several weeks without rainfall or signs of drought stress).
Also, if you just planted these I would consider removing the fruit that they set so that the trees can establish itself better. Newly planted trees, even larger ones, that are allowed to carry fruit to maturity often won't grow well thereafter.