I have 41 acres in texas and all of my surrounding neighbors work together so anything under ten points walks and we take does to keep the population even. We also share camera pics with each other so we know what is moving and where.

Shooting does is a good start. 18 acres won't hold a herd and is too small to manage, but if i were you i'd try to get the neighbors on board. If you pass on young bucks and the neighbor shoots'em nothing is gained.

i don't agree with want big deer just shoot does philosophy or trying to "control" im assuming shooting bad genes out, there is much more to it, its the ratio your after. usually around 2 does to 1 buck. Deer move to much in free range to truly manage the genetics most people think shooting spikes and scrubby looking young bucks is the way to do it but they ruin there age structure doing so and antler size and shape is usually dictated by nutrition. i know Pa has antler restrictions should be good for that.
with 18 acres i would find a summer and fall bedding area;s and plant 2 food plots (they can be 15ft by 15ft and be effective) or even staging areas before they enter farm fields. the deer should move in and out of farm fields at night but can be caught at food plots just before dark or after dusk because they feel safer closer to there bedding areas. also i would move the camera to different places not just in front of stands they will pattern you if you keep just putting it in front of you stands and food plots.