I am trying to use a defencive effect for my cruiser, so I placed a chunk of 40,000 blocks. It was only 52.2% efficient. So I boosted it up to 180,000 blocks, and it became less efficient, the most efficient I could do was 1 block, that gave me 57% efficiency. Is this a bug or is it working properly, if it is working properly then what is the maths behind it and how can one optimise efficiency with defencive effects?