I guess I am back on the thought that if the 51 char string is not something we can shift into a private key, then it must be some kind of 37337 clue and we're looking for a spoon in a haystack with bitshifts and the like.
We have only 41 characters on the right, and 51 characters above. I can't make heads nor tails of what the aim is even meant to be. Even they were the same length I would be slightly happy, but as it is I can do nothing with them. Not even a clue what is going on in the OPs mind with this one.