I wonder if I mismatched some when gluing up piles of tires, since I now have a number of pairs that have always been run together where one feels delicious and the other feels like a blown out open cell. In fact, my latest sets are breaking down/blowing out within a few race days, which is faster than even open cell foams. Did something change? I'm strongly considering switching to AKA foams... Wheels and tires are too expensive and mounting is too time-consuming to use foams that die long before the tires.