#30 feels nicely balanced in terms of playfulness combining the playfulness of colored elements while remaining firmly grounded. The typeface and kerning feel cohesive. I'd be curious to see a version with a warmer color like you used in #37. Do you think ordering the colored stack with lightest value/weight on the left could give it added movement?
#32 In reference to using the "A" as the accented letter, this feels like it may have tipped over. Perhaps the accent in a vertical or more stable position?
#31 There's something interesting about the segmented C which reminds us of the visual design of the NPR clocks seen here at the bottom:
http://www.current.org/2014/07/proposed-npr-clocks-would-add-morning-newscasts-longer-underwriting-credits/ #33 and #34 are a bit too playful or seem tied to a particular time period.
#37 and #38 feel a bit too elementary in terms of education. There's something to be said for multiple elements coming together to create the whole. That is part of our brand, though these shapes don't form a particular shape as a whole.