I figured out why I was getting little to no aim assist and why it was feeling weird in general. It was the firmware I was using. The newest firmware is terrible imo for bo4. I reverted back to the old firmware and I'm back to normal.
Could you tell us what version you were running but are running now?
As soon as I went back to SA3, I felt a HUGE difference with the target assist, but I felt like it was slowing me down to much on the target. So right now I'm using SA4. I'm going to try some other ones later today, but I do want to say after this update, the new firmware does not work well (for me that is).