Are you sure you went through the brake lever "snap" process, and had the brake lever in the right angle when bleeding the lever? These levers were notoriously tough to bleed, and would be spongy or pull all the way to the bar if the air was not completely bled out of the system.
From the sounds of it, if you are certain on the bleeding, then it is likely the bladder is the problem, and rebuilding the lever should fix it. Your issue sounds worse than the normal headaches that people typical ran into with that vintage of XX brakes that gave them their bad reputation.
That vintage of XX brake is known for having the brake lever pull to the bars whenever the slightest amount of air or moisture gets into the brake lever bladder, even when the bladder isn't leaking as bad as yours. SRAM completely redesigned their levers due to this problem. The new levers have bladders made out of a new material with a completely different shape. You wouldn't be too crazy to replace them with a completely different lever. If you decided to rebuild and keep those levers, just make sure to bleed them at least every spring before riding (the old bladder material would allow air/moisture into the system through the wall of the bladder as the bike sits over the winter).
Also avoid flipping the bike completely upside down, even for a short amount of time. That specific brake lever had a problem where if there was any air in the lever, it would go the the worst place possible in the bladder when inverted, and the levers would pull to the bars. If both front and back brakes had air in the system, both could pull to the bars at the same time. Keeping up with regular bleeding reduces the risk. Their re-designed levers don't have that problem anymore.
I saw your link was to the Planet Cyclery warehouse site. Planet Cyclery also has a local bike shop a few blocks away in Broomfield if you decide to go the bike shop route. They could probably do the rebuild.