What is the opinion on culling out spike bucks. I have heard several different ideas about improving the heard.

I have 100 acres to hunt, which butts up to 770 acres of county park that no one is supposed to hunt. We are implementing a six point and bigger rule. This is the fourth year of it, and wow! what a difference we have seen in the amount of buck plus the quality. But that problem of shooting scrubs and spikes keeps arising. We are noticing that there are a few more spikes than I thought should be there. Is the nutrition not high enough or is it genetics. Do we shoot them so they don't breed? Or should we "Let them go, so they can Grow"

Questions?????