Ben,
I know the frustration you are referring to in regards to believing you found a remote area only to discover it has been fairly well explored. It is a trial and error sort of thing and you never know what to expect till you get there, despite what the map or satillite photo may suggest. Keep searching and I am confident you will be rewarded with an out of the way spot few, if any, know about. I have never explored the Colliers mills area although a friend of mine lives adjacent to it (he is not into exploring though). Thanks for a nice article. I'll have to check out this area some day.
As a quick fix for an islolation need. Try driving out in the plains near Spring hill at 3:30 a.m. on a week night some time. I have come to the conclusion that between 3 and 4 a.m. is the lonelist hour in the 24 hour spectrum. Do this and you will feel like you are the only person in the world. Yeah, I know, a little extreme but don't knock it till you tried it.
Jeff