IThe initials in #163 & #164 won't work. See my general comments. The only exception so far has been HIGHLY stylized ones where you would say "Are Pee Bee" when you see it. I was called RPB at a job in another field, so this needs to be a separate identity.
WRT the new graphic in #162, I prefer the simpler ones you did. I don't want to get "cartoonish" - too harsh, but I don't have a better word for it.
I can realte your other graphic elements to my work, but not so much #172. And in my mind, that particular symbol makes me think of the U.S. Steel logo.