Hi, Jeolivi, welcome to the forums.
Yes, I remember having the same issue when I got my War-steed and failing the training quest a few times.
The trick is to try to anticipate the side-slip effect and start your turn well before instinct would tell you to.
[center][url=http://forums.lotro.com/showthread.php?18699-How-to-get-help-on-the-Tech-Forums-and-how-to-contact-Turbine][color=gold]How to get help on the Tech Forums and how to contact Turbine[/color][/url]
[color=green]Please reply to the topic or PM me if a solution I posted works for you: The more data I can gather the better I can help.[/color][/center]