I was 100% the same as you, I have all my coins loose in trays organised how I want, takes up less space and is far nicer to handle and photograph.
However, I have since learned how much people pay crazy money for labels by these companies, amazingly even if the coin is under-graded, or the coin on the label isn't even in the slab!!
My advice therefore would be to think twice about breaking AU-58+ shields, you'll loose some money by doing that no doubt that you've partly paid for in purchasing the coin in the first place.
I've still not graded a single coin myself, anything I get loose has stayed loose, but stuff that I've bought in slabs in currently staying in them