I recently had a couple of paddles on a V9 (the only one in South Africa!) and absolutely loved it. But... all the paddles were downwind and I didn't get the chance to paddle it on flat water.
The cockpit was definitely a narrower, more comfortable fit than the V10S, can't comment on the V8Pro.
Sorry - this is almost entirely irrelevant given the specifics of your question! For me though, given the choice of V8Pro, V10S and V9, I'd go for the V9 every time. If the V10 3g was added to the mix, I'd go V10 3g (which I paddled in Aus, also downwind, 2 years ago).
Rob
Currently Fenn Swordfish S, Epic V10 Double.
Previously: Think Evo II, Carbonology Zest, Fenn Swordfish, Epic V10, Fenn Elite, Red7 Surf70 Pro, Epic V10 Sport, Genius Blu, Kayak Centre Zeplin, Fenn Mako6, Custom Kayaks ICON, Brian's Kayaks Molokai, Brian's Kayaks Wedge and several others...