Your all 3 ke nalu components are same as what I have and been using for my main paddle for about 3 months. Your right it does have a little flex, but less than 1/2 the flex of what the Naish wave le has, (or more appropriately, HAD).The Naish paddle really does feel nice to use, and every time it needed a serious "heave" I would squat, grab low and pull from a couple inches above the blade, which I think prolonged the breakage but didn't prevent it.
Looked a little close to the finish of both, and apart from the trick criss cross shaft pattern, the only 'finesse' on the Naish paddle is the Abs rail on the blade smooth and sleek all the way to the shaft entry opening, where as the ke nalu has clearly had the front and back of the blade glued together, looks a little unfinished in comparison, with a rough finish on both sharp edges of blade.
The function of the Ke Nalu kit does work well, gets me on waves, doesn't slip and feels like it will NEVER break, the Naish flex with the thin shaft and slightly more contoured handle that sits in your palm like you know what, just felt like it gave you more options on the water. The slightly larger blade wasn't at all a hindrance with that rubber feel shaft, but it just doesn't last.