Double foil front fins..?

I’ve been working thru the Mckee web site http://www.mckeesurf.com/brucemckee/multisystem.htm

to research a baseline quad set-up for my new board - 8’0 x 13.5 x 21.4 x 14 thumbtail with long light V and shallow double concaves, with five FCS slots for quad/tri - and settled on M5 80/20 sides up front and M5 double foil in the rear for the quad setup.

Has anyone tried their quads or tri’s with double foiled front fins, and if so, what is gained and/or lost?

Never have and can’t see how they would work anywhere else but centre.