Friend bad news ....... every test failed with the fixed FA.sfx
seems the old one is working so good, didnt have an error though if you want i can help you fix it yourself
download my FA.sfx i estimate you have it and download this program i give you here
open my FA.sfx and see the tricks i did inside and try make changes to your needs,
though let me tell you something before you proceed,
msc+srep+exe2+delta+4x4:lzma:max:100m
is the best and will always will be stable method to use
precomp is the only one to bring you trouble and the reason is " it doesnt support " stdout "
if you keep the FA.sfx i gave you without touching anything, the method above will be 100% stable, though i commend you to try and bring precomp as well and then share with me if it gets stable.
Good luck and i hope that long text helped