> All of these claims really throw me off from praying the Rosary
I would probably consider shelving the book, if it's not working for you right now and if you have no specific need to read this book, and (a) just pray the rosary on your previous schedule without worrying about whether it is better or worse than other prayers, and (b) find a different book written by a different saint to read.
It could even still be a Marian sort of book, as long as it is a different author... they all have different writing styles. https://www.amazon.com/Daughter-Zion-Meditations-Churchs-Marian/dp/0898700264 would be a very different experience, for example (author is not a saint but I think we all like him anyway).