When you were laid off in 2003 you were given a choice to bump, but not the station that, I am assuming you wanted to bump to. Just because there were junior people in DFW, dose not mean that according to the "juniority list" that those individuals were the lowest in the system and next in line to being bumped. Remember it goes by senority, those people in JFK, Bos, ORD, might have been junior to those in DFW, so those more junior people would be subject to bumping not the DFW AMTs.
Looking at the current Contract book, I can't find reference to a 10% limit in regards to bumping at all. I don't have any of the older agreements, but like I stated, I never heard of a 10% cap. The only cap will be, if it is not removed from the current contract, is Station and System protection. So if the company asks a judge to disallow bumping, oh well, but I have not seen anything in official writing that states that the company wants to stop bumping. Like I always say, show me in writing.