My experience with Kongs is pretty much spot on with Doth Savek, the Kongs consistently scale higher than the marked weight, significant variance in dome, and really do not have the distance potential to challenge a Boss/Destroyer.
My theory, which has no scientific studies backing it, is that the Kong's stiff plastic will not rotate as much or as fast, so the disc will not fly as far. My theory was helped today by the heat, it was 85, which is very hot for where I live, and all my discs were warm and soft, especially my Champion TL3, it was basically Gstar in the heat, but back to the Kong - the heat softened it up and it did fly farther today than normal, and I did use it on several holes and consistently noticed the improvement in distance, but still did not come close to the Boss which is my main distance driver. The Bosses are all seasoned though.