HSJ said..
I run quad on 2019 starby pro 8x29 starlight construction- 4 medium black quobbas. I am 80kg. Fronts flat foil, rears 50/50. Amazing combo. It is my Bali board and never comes home to Oz. Handles drops with ease , accelerates, drives off bottom loose off top, awesome on the float. Prior to this my Indo board was a JP 8x27 pro thruster and that went best with 3 x medium c-drives. Quobbas didn't do it the JP. I also run 4x quobba flat foil, large fronts and medium rears ( the more flexi orange variety ) on carbon hypernut 7'2 in beach breaks. Feels fast but I don't own a watch, let alone one with a speedo.
interesting to read your experience with the JP.
my 8'1 JP surf pro is an incredible board with quobbas in a quad setup, but sluggish and unresponsive as a thruster with quobbas despite experimenting with different configurations and sizes.
as a quad i can feel the tail instantly bite off the drop on steep faces and then hold and accelerate down the line. it performs like i never thought possible on a SUP. the only issue i have is washing speed off!
i run large yellow fronts and medium orange rears in bigger surf & orange mediums all round in smaller stuff
and enthusiasm from making sections , fast n fun, bagus wave count 
