The cache is not at the posted coordinates, but should be at:
85FPVXPJ+V7
Here's a possibly obscure hint in pictures. Maybe it will help. Perhaps it will make sense after solving the puzzle - but then what use is it? Even if you speak parseltonge it probably wont help. But it does show how warped my mind is!
You can validate your puzzle solution with certitude.
Congratulations to NYWanderer for FTS and LostinDenver for FTF.