This method only works because lolz set to high -mc parameter (works like -l parameter in srep)
-mc1023 sets lz matches not to search for lz libs less than 1023kb(?) if i understand right (but i might not)
then xz (lz77) searches for rest of headers less than 1023kb... it compresses what's left by lolz
better to use lolz only and set -mc to 128 or less but this has a great impact on compression speed... (you can use -mt4/x parameter to compensate: it doesn't such have a great impact on final compression ratio)
Again, i might get wrong about how this all works ...if you have better explanation i would be glad to learn from you Guys