Give them some time to adjust. It may take weeks for things to settle. I introduced a rescued male to my female and she was quite standoffish. They were both the same age. When you train or play with them do so equally with both and do not favor one over the other during these sessions. If your female has a favorite spot do not let the male supplant her. However, make sure you allow both equal access to you. In other words I had to move to the middle of the couch and later on it didn't matter anymore.
In my case and after a while (about two months) they adjusted to the new makeup of the household. And sure they still had their snits from time to time but I always growl louder than they can to remind both who is the top dog in the pack. As you know they have unique personalities and hopefully with love and patience and you being the leader they will learn all is ok.