if you wanna go with more optimal usage of srep you can definitely use it this way
srep+<whatever precompressor you desire>+srep+<whatever compressors you desire>
feeding it this way elimates duplicates before making their way to precompressors so, not only precompressors do less job but also you can use srep:m5f:a1 after it to make it pack tighter 
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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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