Is that the only place you can practice them? Would you be able to try in your garage or any other small, flat space?
The reason I ask is bc this link and the karl is easier for me to do in smaller circles. It's much harder for me to pull when traveling in a straight line, and even if I am going in a perfectly straight steam, as soon as I switch into karl, I immediately start carving to the right. You almost got it down though. Once you get the switch down it becomes natural pretty quickly & you can almost "snap" right into it from the steamroller.
Sorry this older video is extremely horrible quality and very dark, but maybe it will help:
i will try to upload a better one soon.