Adventures in SciFi Publishing discussion

(Tim here)
ATPT is a unique experience in reading. I am at times in awe of Tori, her character arc, and the far reach between her and happiness, but other times I'm confused or not as interested in what is going on. The halfway point introduced some surprising conflict, leaving me very interested in how it will wrap up, but on a page by page basis, I'm either disinterested or interested about equally. I'm not sure how to pin down why I lose interest. I've mostly kept track of the characters, and like Muir-Smith and Elizabeth as secondary characters. Maybe it's not moving quickly enough? I'm not sure. Anyone else have thoughts on this?