Hey, congratulations! You found an "easter egg" (maybe you are even the first, at least the first to tell me :) ).
I was strapped for time due to the game jam deadline and I kinda suspected my "par" solutions might not be the most optimal. So I included the 4/3 result as a reward for beating my intended best solution.
So for these levels you beat the author :)
I did spend some time testing my solutions and could not come up with better ones, so I would be interested how you did it, if you can remember.
Cheers!