Your designs are interesting but the Powered by CosaTron is hard to read in some like 77 and 74 in a small version of the logo this would be lost. However, you are the only designer who has played with font size on the tag line and making CosaTron bigger is an interesting idea.
Thank you for the kind feedback thats minor adjustment can be made for the tag line to be more visible. I'll make updates for your ranking consideration would love to be in top5 phase of the contest to compete for your logo. Thanks again.