Dean Pappas amplifies this in a nice article in the latest (I think) Model Aviation. Pitching moment due to pitch rate is still missing, but he may cover it next month.
Good point. As the plane turns the downwash from the wing increases, reducing the effectiveness of the tail. So the harder the plane is turning the less stable it becomes. One reason why planes with marginal static stability seem to get "stuck" in a hard corner and are hard to bring out of the turn on heading. That is in addition to the pilot getting locked up in the turn too. It can be hard to pull a hard turn and then back out of it at the right time.