I have the ExocetRF 81 version 2, I highly recommend it for freerace, I've used it with sails 4.1 - 7.8, I'm 88kg , it works with wave or camber race and foil sails. I find their volume concept is interesting and works well, board flies very early, handles open ocean to flat water foiling.
Deck is totally flat and this works better than rounded rails or domed volume boards. I can't imagine needing more width unless you are focused exclusively on racing, if so the starboard IG is the board, unless you are in the PWA that allows open class boards.
I'm using this with the AFS95 foil, works great! Price is fair for carbon board at $2100.
www.exocet-original.com/rf-foil-carbon-c2x33092216* On RF 71 and RF 81, we have distinguished the notion of felt volume and real volume. Indeed, if the real volume brings the buoyancy necessary for an early start, a great comfort when stopped and during transitions despite the short length, the volume felt once in flight is completely different. In this phase, the board seems much more lively, free, less cumbersome than the real volume might suggest. The feeling is present but to a lesser extent on the RF 91 and RF 100, which explains why we have kept the real volume.
Felt Volume 168 Liters - Real Volume 182 Liters - Deep Tuttle Foil Box RF 81cm x 210 cm81 cm weight 8.8kg sail range 4,0 - 8,5 m2
windfoilfan.glissattitude.com/devices/board/exocet-rf-71-carbon-2020, also there is a review of the RF81 at the same website.