The Church does not have an “official” position on the Rosary, other than that it is one of the , if not the most, popular private prayers of Catholics (and not a few non-Catholics, interestingly). There is no “official” right way to say it. You can say it with or without reciting “Hail, Holy Queen” at the end, or any other ending which people may use. You can say the Sorrowful, Joyous,Glorious, and/or the Luminous mysteries; you can say them on what are “suggested” days or on other days; you can add in the “Oh, My Jesus” addition at the start of a decade or not; you can say 5 decades, or more, or less.
The first objective is to pray. The second objective might be to pray in a format that is widely accepted, but that objective is a personal choice.
And from my own humble opinion, it might be better to say less, while being focused on what is said, than to say more and have one’s mind wandering all over the “back acreage”. The purpose of prayer is to actively communicate with God (and Mary, and etc.) than to “rattle the beads”, as it were.