Changing plot aspects to create tension, trim long-winded sections, etc. are justifiable, but yes when they appear to be for no discernible reason they become a distraction.
Wasn’t Project Noah designed to produce weaponized enhanced humans for the military? It’s been a while since I read The Passage (didn’t continue with the other books) and I don’t recall the rationale for Project Noah being to combat an avian flu or early onset Alzheimers.
Did they explain that Carter is innocent though he was convicted of murder?
Agree with @menzo that Saniyya Sidney does a good job. And I like my vamps bestial, the whole blood sucking/eroticism thing always creeps me out.
I did find my mind wandering at points and was checking my phone so I don’t think this will hold my interest.