I've written about the Trinity and procession extensively in this booklet:
The claim that the Holy Spirit is the Love between the Father and the Son is not correct. The attribute of Love belongs fully to each of the Three Persons. The claim that the Son is the Knowledge of the Father is not correct. The attribute of knowledge belongs to each of the Three Persons.
Every attribute of the Divine Nature (existence, will, knowledge, love, mercy, justice, power, etc.) is fully possessed by each of the Three Persons. That is the meaning of the term consubstantial -- i.e. that each has the same substance (or nature).
There is a certain analogy that is used to describe the relation between the three persons, in which the Father is analogous to will, the Son to knowledge, and the Spirit to love. And that is a good analogy, but it is only an analogy.
Saint Thomas says
"the Father and the Son love each other not by the Holy Ghost, but by their essence. Hence Augustine says (De Trin. xv, 7): 'Who dares to say that the Father loves neither Himself, nor the Son, nor the Holy Ghost, except by the Holy Ghost?' "
If we say that the Spirit is the love between the Father and the Son, then the love of the Father and the love of the Son would be only in the Spirit, not in the Father or the Son. This claim denies the dogma that all Three Persons are consubstantial. It is an heretical claim (and one of the more grievous errors taught by Michael Voris).