actually Trintium really doesn't make sense, since the maximum temperature in the game is 10000K, and so it can't fuse at 20000. Helium is basically a combination of what we have (most gasses go opposite gravity already and NBLE is the substitute for it that can fuse)
increasing the limit that has been there forever just for one poorly suggested element doesn't really make sense. It could cause unintended side effects that I can't even think of, and many things (like fusion) are designed to happen right below the cap.