Well, so the jb is known to survive. And there is nothing so much new except the Ember Bold font which comes in 5.8.7.0.1. It is the last known version which has a ability for factory downgrades. And a secong thing, 5.8.8 and 5.8.9.2 brought many improvements only for manga readers. Hence, i would suggest you to stay at the maximum at 5.8.7.0.1. Anuthing more than that, can be sometime a damage because you cannot jb again.
So, my suggestion stay where you are, or get to 5.7.4, 5.8.2 or a max of 5.8.7.0.1