Rocke,
I'm much heavier than you, I probably don't do as much maintence as you, I am a gear masher and have been using a campy 10 speed chain for around 5 years with no trouble. I should also mention that I abuse the chain more than most by not switching chainrings as much as I should so the chain gets crossed quite a bit. Maybe I'm just lucky or maybe I got the good chain while you got the bad one. Wish I could be more helpful. Hope you feel better soon.