all kept in the same conditions, even though the 2010's are 6 yrs younger why is the CO2 that is 'un-used' still the only 1 that stays soild over night..?
there's no better board than a jaime love that board. North bladders are known to delaminate in lower temperatures than other kites. Good kites, great control bar, the rebel is especially solid all around kite. I go through two pumps a year, I have resewn my harness several times, go find myself some new buckles and webbing, and a sewing awl not a problem. The actual canopy fabric on your co2, wainman and north is all exactly the same, Teijin Technoforce T9600, the only difference is how many reinforcement points they put on the kite.
I believe the key word in why the co2 is in such good condition is this word : "unused"
The co2 valves on that year I told you, they used less plasticizer on it, that's why it can take more heat. But it's not a good solution because it makes the valves brittle that's why they quit making them like that.
ps don't use the old bar on your co2 use a new bar the north bar should work fine, in 5 line mode, the 2003 bar that came with that kite is positively dangerous.