I think Kenalu is a good option for a custom make up (not that I've tried a lot ??). A range of varying flex options to couple with heaps of shapes and sizes blades. Check out some long distance threads on other forums they talk about paddles heaps, and long discussions re kenalu.
I was doing damage to my shoulder with a cheap 2 piece paddle that was very stiff with quite a large scoopy blade, that always used it extended about 6 inches longer than my height. It got to the stage where my aching shoulder was keeping me from sleep.
Now i use a kenalu 'xtuf-s' shaft, the second flexiest option. 'Xtuf' is the flexiest, and there are 2 or three stiffer that i think are more for racing, but they must be pretty stiff as really the xtuf-s is quite stiff. There is flex there but its certainly not one of those spaghetti paddles that look like they're going to snap any second. Have paired with a Mana 82 blade which seems a bit smaller in area than the Sunova blades which are also advertised as 82 sq in, although haven't actually lined the two up to compare closely, it may be an illusion though as the mana is a different narrower shape with sort of bent winglet edges.
I have made the overall paddle length 1 inch over head.
Has done wonders for the shoulder. Its light as a feather. I can get carried away sprinting for waves and never get pinged or sore anymore. Shorter length forces a different paddle technique where you bend the knees more and that helps the balance heaps.
Very fast delivery too! That could've been lucky tho.
Gotta find a heat gun to assemble. They come with a small bag of hot glue pellets but I also ended up getting a pack of hot glue sticks from spotlight because after the first time i put it together there was a clicking movement between the blade and shaft. Reassembled with ****eloads more glue and the proper twist and push in and out to get the glue well spread. Solid now.