Bismillah
First off, Jazaki Allah khairan Jennifer for this excellent post.
dear naseeha:
سبحان الله وبحمده سبحان الله العظيم عدد خلقه ورضا نفسه ,وزنة عرشه ومداد كلماته
naseeha, the objective is to keep your tongue moist with the dhikr of Allah, so moving your tongue shall increase the reward. It does not matter though to say them outloud, you are speaking to the All Hearing any way.