I am a firm believer in Clinton Andersons one rein stop method. You do this over and over until it becomes second nature. And then you of course use it when needed. My horse is also spooky, spin and bolt is what she does. It’s gotten to where when I go to do the one rein stop, she stops and brings her head around as soon as I lift a rein. It’s saved my butt on several occasions, and she rarely spooks anymore. It’s just too much trouble for her to stop and flex side to side. It REALLY has worked for me.