Mutation size.
Limit wheel position mutations.
We generate a skewed distribution.  Prefer the best performers.
Don't use speed in score.  Do use height.
Reduce weight of height in score.
Dont get steep so suddenly.
Use center of wheel base instead of chassis origin for scoring position.
Improve the way we calculate that score slightly.
Tweak the distribution for choosing parents.
Prevent caching
Go back to just using horizontal position for scoring.
Use a loop.
Dead code.
Simplify slightly.