Johnny,
We've been battling the same problem where I hunt. Three weeks ago I watched 2 different trucks ride down the road. Each one had 3 guys in the back of it with guns. They hunt from the road all the time and kill deer on other peoples land. We have been in arguments more times than I care to remember, two of which almost ended up in a fight. We've talked to the game warden several times. Even invited them to park on our land far enough back so the doggers can't see their vehicle. They've never showed up. I'm sure there are some guys out there that hunt with dogs legally but the ones around us sure don't. I would say you did the right thing. Like you said, you're doing things the legal way so you have nothing to worry about. Hopefully your game warden will take care of the problem for you.