your work is excellent, I would like to see the helmets facing each other. we will have other projects, so hopefully we can work together. sorry we have been slow to react on this
78 looks great, the mic needs to be lower so it is infront of the jaw section of the helmet. i am not crazy about the black and red text either, try white for Pit or some other color combinations, the american flag designs are cool and a great tie in with the tagline but may not work, if the text doesn't look great
try using the blue for pit and radio and dropping the wording back to the bottom like the other logo's and have the helmets on top, play with the fonts a little more.