Wow!! I can feel your worry and concern. Maybe it would help to go back to the Reading Behaviors and practice only those for a bit. Then move slooooowwllyy back through building stamina, and review the I Charts. Take away any choice of what to do that you have given them for a bit of time.
Sometimes we have to take two steps back to get a step ahead–it’s hard, but necessary.
Keep us posted on how it’s going.

Don’t give up! It is so true that every class has their own unique chemistry and challenges. As far as things to try with the students who are struggling with “read to self,” you might try going back to modeling and practicing the 3 ways to read a book, if not In a whole class anchor lesson, then perhaps in a small group of those kids who are struggling. Do you have some students who are doing well with these behaviors who could model for an anchor review lesson, or successful students from your class last year who could come in as “guest” demonstrators? Sometimes peer modeling and pairing can be very powerful in these situations. Good luck to you! Your sincere “teacher’s heart” shines through beautifully in your message.