The reason why the nozzle of the perfume bottom is jammed is because the metal ball is stuck in the spring. This prevents the pump from retracting. The metal ball is supposed to be directly at the bottom of the spring which allows the pump to retract and the product to protrude out of the bottle when you press down on the nozzle.
I would say go for decants as well, I am about done with the atomizers that are on actual bottles
Half the time you get air shots( especially if you havent sprayed it for a few days, which happens often if you have a large collection) some spray in jets, others veer off to the left or right, some dribble
The cheapest Frag I have Quorum seems to have the best atomizer , controllable as well if you tap it lightly
I have always wondered why some of my frags smells so much better , more powerful from a glass atomiser , especially if I initially bought a decant. I guess Maceration plays a part, But I also think glass atomisers spray out a nicer , finer mist so you can get a more even distribution