this is because you gave reflate too much data as input ..... reflate is known to do that switch to placebo  ratio is gonna be the same either way 
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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