Your 2nd and 3rd ranked logos have all the necessary components to form an ultimate logo. Please consider the DNA graphics of your 2nd ranked design mixed with the DIAGEN + underlining script from the 3rd ranked design.
Also, please note that the colour arrangement chosen here is great, but would be good to see a lighter version with red and blue instead (as per the original design agenda and description posted).
Finally, please consider the idea of 'personal touch'... e.g. may be improve graphics to encompass the design (Hugging the wording).
Thank you for your comment, I have uploaded the modified version (with the wording of rank 3 and the design of rank 2) along with different colour versions
Please let me know if you would like further changes