I really don't think "rushing" is the actual problem with any sort of adaptation. A capable adaptation is one where the actual length of the original material does not matter because the adapted material feels complete in itself. As long as that rule remains true, how fast or slow it is going compared to the source has little bearing on the quality of the adapted work.
In terms of the number of chapters actually being "adapted" into an episode, ep4 isn't any different from the first 3 episodes. They're moving at about 5 chapters per episode. But given how ep4 feels totally different from the first 3 episodes in terms of actual pace and tone in the episode itself, I think that's a clear sign that the actual difference is in the writing and direction, and how the adaptation is being handled.
They didn't slow the adaptation down in ep4, it just got better. Probably because Yoshino didn't write it. Even if Yoshino has a ton of episodes for the Balbaad arc, if he's a bad writer, it's hard to be optimistic about the results. Hopefully he finds himself busy with
some other bad show, and other writers continue working on the show instead.