My thoughts with the Hyper Evolution affect of going Warp 10 / Infinite Speed is that you're going so fast that you encounter a special space or area of space that affects your genetics and causes the Hyper Evolution. But since you're moving so fast, you have nearly no way of preventing yourself from passing through that special area of space. The speed itself doesn't cause the wierd Hyper Evolution, IMO; it's some part of space that has a special property or radiation that would cause the funky Hyper Evolution. Every other time we've seen somebody go faster, there usually isn't any problems with going fast in & of itself. There are plenty of weird areas of space that causes funky affects on the biologcal body. Given how fast you're going at Warp 10 / Infinity, avoiding those areas of space can be incredibly hard.