I have a 7’10 vaquero. I run the 8 3/4 aflex it came with. Is yours gonna be an edge? To be honest , I would ride whatever fin Marc sends and adjust accordingly .
Agree with this - I've got a 7'9" with the same fin and small adjustments make a difference. Also dig the True Ames L-Flex as well at 9", pretty flexy.
I've only surfed the Powerblade in @BrazilButtNut's APE Edge, and it was magic in that board, but that could have been the combo of edge and fin.