If it’s perfect hands with zero variation in size the length of the crack would determine the difficulty me thinks. Is it as long as my butt crack or the nutt cracker?
This neck of the woods, a 2” splitter would get 5.8…. Even ones that lean one way or another to make it more tricky only gets 8+. But didn’t OP say he is going to JTree? It might only be an 8 there too.
Personally, perfect hands for me are 1” cracks, but I don’t think we are talking that size….