WELCOME to the Forum!!
Spooks as you describe sounds a dream compared to the spin, rear and bolt done all at the same time it feels.
What you describe as a spook, well, if you work with racing horses you know what a spook can be like to hold onto from the ground, forget astride.
All I can tell you I've found is I sing when nervous cause it makes me breathe in rhythm and that seems to help settle nerves of horse and me.
Trying to remain loose and limber also helps to absorb the sudden jerky movements a spook comes with when astride.
The horse looking at something new and different is a observant animal, one who actually to me would keep me safe on the trails...aware of danger.
a thinking horse, not
a reactive one...
A horse like this who thinks before action is taken to me is a pleasure to ride...
Warned before a explosion if a explosion were to ever happen.
Eyes up, be alert to new things, sing and breathe will get you enjoying your ride time much more.