Default active showed too many old posts in the feed that never disappeared.
Hot was a little better, but still put too much weight on upvotes and comments leading to several day old posts showing up consistently despite all the communities I had subscribed to.
So what I’ve settled on for now has been new and top day, which has now been showing more new content instead of posts being buried.
The auto scrolling bug was fixed in the latest version of Lemmy. If you’re instance isn’t on 0.18.0, talk to your admin about upgrading.