OK, I'm using Maximum compression I was doing some more comparisons between VC4 and ISZ, and only in really large files (>4GB) ISZ is the winner but I'm still having the same situation... I'm not so sure but there some open LZMA code around ;), VC4 is using that one
Sorry! but I'm using spanish and the literal translation will be "compresion maxima" = "Max Compression", but in any case it's the highest the one I am using