Yeah I say dont give up.. I dont know the first thing about breeding them but if you've got them laying then id say your already three quarters the way there..
One thing I dont have a clue about is if 2 female discus can pair up? I know its possible with angels and other fish maybe this is the case with your ones?
Also you mention movement around the tank, some fish are a bit worried when with babies so if theres heaps of action then maybe move them to somewhere a little quieter.. Also I think if you decided to stick poly over the front of the tank everytime there were people in the room it will freak them out more.
How many times have your pair layed? Maybe they're just new at it and need to give it a go a few more times.
Either way dont give up there are a few people on here that are really good people and breed alot of discus and im sure they will help you out.