I'm late to the party but just picked up the JP 7'6 x 29- 115 litres slate yesterday and got it wet this morn in 2-4 ft fun. I'll throw in a snappy review for the riders of larger proportions as I'm in that class. For perspective I crack the scales at the ton mark (100 kg+) and 6ft tall. This board was a cracker to ride and I'm betting it will be my goto board for while it was so much fun.
Stability- 8/10 (for me it was only a little less stable than my 9ft SB surf pro).
Glide- its got nearly none......

I miss timed my paddle speed on the first 3 or 4 waves and fell off the back of the wave as my other boards would have had enough speed to get on easily......after that I changed tactics and my take off position and got on a nice 3 footer. It didnt help that I was also paddling into an offshore medium breeze during this surf.....easy paddle out but paddling onto a wave felt like I was facing an industrial fan...

Turning- (board was set up as a thruster).... 12/10.....

Got on the wave and put the board into a bottom turn applying the same amount of pressure as I would with my other other boards and this thing was fast and turned (too easily) on a dime.....which took me by surpirise as I had put the board into a 360 before I knew what was happening.....wipeout.....the next few waves I dialled back the amount of pressure I usually use to turn and the board was magical and down the line speed was huge.
Some other points of note were, the ability to take off on a wave with extremely steep first section and this board just ate it up handling it easily where as my other boards I would have been leaning back to the extreme to try and keep the nose out of the sandbank for the takeoff.
I will be playing around with the fins a bit more as I would like a bit more control when turning in waves with a bit of speed/ power to them......maybe even a 5 fin set up to see how it goes....