The African merican Heritage Hymnal, Keyboard format, is worth every cent of the $50.00 give or take that it costs. Sounds like you need one. They have so many hymns included and they(Two volumes) are spiral bound with big print so that they lay flat and are easy to read fast. You can read them slowly to figure out exactly how the hymns go, then speed them up. I would buy a new set the same day if mine were lost.
It is surprising how often the way that you play hymns is so different from the way that they are written. Sometimes radically different, so the books are helpful in that way. I sometimes just pick up the books and play hymns as a matter of review.
They are great as practice books for learning to read music, and in particular, hymns.
berbie