The home and away makes a difference, last season I got a draw only at a weak team, then trounced him at home.

You are not the only one who said their players slumped after updating, so I dunno. I was thinking those teams that were holding a lot of points and had them auto assigned might change how they play, and maybe not all for better. But managers that don't save any SK have said similar to you experience, too.

Also I had a couple players slump the end of the last Season but that's pretty average.