So, I'm back with some updates. I tried to incorporate all you suggestions and opinions.
1/ Symmetry: mirrored "a" is looking good, symbol is more optical balanced and what's interesting, it's still looking like "as", even though it's "aa". Also added arrows.
2/ Shield: I'm submitting two versions with different proportions, personally preferring #78 with more pronounced background.
There are two new fonts used, both with modern look but I think the one used in #78 goes better with overall logo visual.