Use this instead, it's better and not freezing at all (even with 19gb single file).
http://fileforums.com/showthread.php?t=98731
This settings should work without problems
packcmd = pZLib e -m2 -x -c32m -t25p - -o - $$arcdatafile$$.tmp -o - <stdout> -v
unpackcmd = pZLib d -t100p - -o - <stdin> <stdout>
And Sims 4 decompression is OK here. So no problems with resource files.
And for reflate, use reflateapi ->
http://krinkels.org/resources/reflate-api.247/
It's faster.