Dan is a CX dealer so he can speak better on the spine issue. Dan - it looks like his final arrow length is 28".
I just removed lighted nocks from my set-up.
Because :
1. They are heavy and do adeversely affect FOC.
2. They are something else to worry about - batteries, inadvertent activation, practice nocks etc.
3. They actually cost me a double this fall during a suburban management hunt. I killed a doe which looped around and fell within a few yards of where I shot her. Her button buck brother returned to the scene but was frightened away by the brightly flashing nock. Without the lighted nock, he would have gotten a ride to Hunter's-for-the-Hungry too.
4. They're expensive.
5. I do not hear a lot of success stories about improved recovery rates. Maybe some other folks will have more positive things to say.