Does the original aerator have a gasket you could use? It may work better than the ones you have? Otherwise, I would not worry about it!
As long as you have a decent amount of pressure you should be good to go.
I soak my bottles in Oxyclean free for several hours to several days and just rinse with hot tap water 2-3 times before sanitizing. The Oxyclean does all the "work" and I love it!
“I don't drink beer all the time but I can drink (a) beer anytime" - Me