McH, damn you for this post. Lol.
You know I have much info but no time to get into detail on these boards.
I've had the Vouch as a 9'6 Twin Keel which was slippery and fun in small surf, not a bigger wave board with the Twin Keel set up IMHO, but as a single fin it's a damn beauty in any conditions. A board in my quiver I'd not sell.
I took another crack at the Twin Keel a year on in a 10' and still disliked it

I've ridden Josh Hall's own 9'6 Long Fish and his key is deep double 'caves with a small centre fin (5-6) with the timber side bites. Was a beautiful ride, loose, fast and super speed down the line.
The Vouch is very different to the JH on the underside; the Vouch is a flat / hull whereby the JH has deep double 'caves (see pics below).
Having the 9'6 Vouch (single) and an 11'8 JH, they both rock but are like driving two different machines.