Well, I'm not familiar with your herd, but making it an 8 point or better on our land is going to kill a lot of 2 1/2 and some 1 1/2 year old deer, who would have had great potential for trophy deer. I also must add that a lot of "mature" deer are not going to have enough points by your rules to be taken.
May I suggest in teaching your people who you have hunt on your land, what a mature deer looks like. Yes, I know it may be difficult, and takes time and experience and it is easier to do the points, but, if you really want to grow trophy deer, the points will kill you.
To a certain degree though, if your neighbors are shooting what ever is walking, your trophy management may be of little use. Have you talked with the neighbors and what their plans are for deer harvest?
What management do you want? I wrote "trophy" but you may not want that for your management. To me , a "trophy" deer is a mature deer.