Reduce FLAC size by ~1% at cost of several minutes runtime

#!/bin/sh
for f in "$@"
do
    NEWPATH="`dirname "$f"`/`basename "$f" .flac`-re.flac"
    flac -V -8 --mid-side --exhaustive-model-search --qlp-coeff-precision-search --replay-gain --rice-partition-order=8 --apodization=bartlett --apodization=bartlett_hann --apodization=blackman --apodization=blackman_harris_4term_92db --apodization=connes --apodization=flattop --apodization=gauss\(0.25\) --apodization=gauss\(0.5\) --apodization=hamming --apodization=hann --apodization=kaiser_bessel --apodization=nuttall --apodization=rectangle --apodization=triangle --apodization=tukey\(0.25\) --apodization=tukey\(0.5\) --apodization=tukey\(0.75\) --apodization=partial_tukey\(2\) --apodization=partial_tukey\(2/0.2\) --apodization=partial_tukey\(2/0.2/0.5\) --apodization=partial_tukey\(3\) --apodization=partial_tukey\(3/0.2\) --apodization=partial_tukey\(3/0.2/0.5\) --apodization=punchout_tukey\(3\) --apodization=punchout_tukey\(3/0.2\) --apodization=punchout_tukey\(3/0.2/0.5\) --apodization=punchout_tukey\(4\) --apodization=punchout_tukey\(4/0.2\) --apodization=punchout_tukey\(4/0.2/0.5\) --apodization=welch -o "${NEWPATH}" "$f"
    OUT=$?
    if [ $OUT -eq 0 ];then
        if [ `stat -f "%z" "${NEWPATH}"` -lt `stat -f "%z" "$f"` ];then
            mv "${NEWPATH}" "$f"
        else
            rm "${NEWPATH}"
        fi
    else
        echo "Couldn't encode" $f
    fi
done