You might consider a couple of trail-cameras to find out what/who is tampering with your feeders. If it is in fact a raccoon and you already accosted your neighbors, it will make for terse relations. I myself always want a good relationship with adjoining landowners to keep an eye on each others properties, etc. If your camera reveals the neighbors junking your feeders, then you have ammunition to confront the landowner/authorities.
Secondly, you might consider giving the fenceline situation a hunting season or so... that feeder may be gone and the situation may take care of itself if there aren't many deer going to the feeder. Unfortunately, there are no laws (at least in my state) concerning fence line hunting, so they are probably within their rights.
I don't understand, however, how their new fence took 150 acres from your property. Was the property recently surveyed, and they found the boundary fence was installed in the wrong place?
I dislike property boundary fenceline hunting as much as anyone, but I also understand that it is legal in my area. If the neighbors are in fact trespassing and vandalizing private property, they are criminals and should be treated as such. If they are only guilty of fenceline hunting, take stock of the importance of the relationship you do/don't have with your neighbor. It may be that the landowner has leased the property and is unaware of the fenceline feeder altogether. There are a lot of factors to consider.
Good luck!