This thread sort of confirms my beliefs about my aquarium's trim.
Aquarium Trim Question jsoong made a good post.
My 75g tank is 3/8" glass and has a 10" glass brace on top in the middle. As I mentioned, the trim that I pulled of seemed really flimsy and came off with no effort.
I'm nearly certain my tank will be fine with no trim. I have it full right now and have no bowing at all, measures 18" deep on the sides and 18" deep in the center.