I'm nearing generation 90 and I've only had one that beat the 200-barrier -and that was almost 10 generations ago. Whatever great advance it had was lost when it bred back and nothing can beat 200. it's been stuck at around 200-max since about gen 10. And even after nearly 90 generations there are still 4-5 still-born examples that are totally incapable of going more than zero unless they are so misshapen that they fall over forwards. Every once in a while a perfectly viable one spawns upside-down and dies an ignoble death -failing just as badly as ******** ones with no wheel clearance.