On #17 I like the direction your going better. Can you eliminate the dark background. Make the logo blue, and maybe a second one that's a (darker) green make the line underneath solid green, then go from green to a black checkered flag on the end (if that makes sense) similar to CS logo I attached. The idea is that it represent progress in racing terms by going from a green flag, (start) to a checkered flag (end of race).
can you make the checkered flag a little bit more subtle. Maybe combine the straight lines underneath, and then have the checkered flag like the Carroll Shelby logo. I'm getting some feedback today from others to see what they like.