RE: Did I lime it enough?
You may also want to check out Imperial Whitetail Extreme, it can tolerate PH as low as 5.4 I think. I've experienced a similar situation, clearing out a spot for a small food plot in the woods. When we started, the ph was 4.5. The food plot is really small, maybe 25 yards X 20 yards. We used about 600 lbs of lime and that wasn't nearly enough.
All the decaying wood from dead trees adds to the acidity of the soil. If you see ferns popping up, then most likely you need more lime.