UUMMMMM...sorry:)
My spurs are kid size very short shank, I really have to turn my ankle in to get him with them. I basically just use them for just what you said, and obstacle that he needs encouragement on.
It's more from my knee down that I am having to really pay attention to. I'm figuring it will make me a better rider, improve my skills.
Today I got some fairly good circles out of him going to the right. I stopped after a good one. Hopefully he'll catch on.
Becky