The size difference comes from the fact that FLAC compresses the files losslessly, and the files are not the same compressibility. mp3 is lossy, so it just “shaves off” whatever is necessary to achieve it’s goals. That’s where the uniformity comes from.
Believe me, these files go through several tests and quality control checks before I release them. Visual, auditory, spectal analysis, playability, extractability, playability etc. after extraction, etc. etc.
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