Maybe a few hints, maybe it works for you, maybe it doesn't. Not about spine or anything, but making arrows in general. Here's what I do.
When I'm prepping shafts, I have to be in a certain state of mind. Don't be in a bad mood or it'll reflect in your arrowmaking. You'll let little frustrations build into big ones and before you know it, you've messed up a shaft that otherwise would've been fine with a little patience. You can use arrowmaking to meditate, so to speak, but make sure it's putting you into that "sweet spot" where you become the arrow in progress.
Straightening is a very critical point where that little drive towards perfectionism can lead towards cracking or breaking if you're not careful. It's important to have the right "set and setting" there, if you know what I mean. I tune everything out while I'm doing this. I put on headphones and listen to the same song over and over again while I'm doing this.
Get rid of distractions while you're doing nocks and points. You need to be making arrows. If you're making arrows, be making arrows.
Breathe life into the arrows. Think of them like beings you're creating. Visualize them as you wish to see them and it will be so.