These still aren't really detailed enough - people reading the changelog won't know how significant these changes are based only on their new values.

I suggest:
```
Decreased Tiberium damage rate by a factor of 3.
Decreased Visceroid health by 25% and removed their ability to gain experience.
Increased the chance of Tiberium or chemical deaths spawning a Visceroid from 2% to 10%.
```