If your system experiences periods of greater and lesser load, then using the rest of whatever is its load capacity, during periods of lesser load, on further compressing its contents might be worth the bother.

Perhaps better than stepping to a different compression algorithm, zstd has multiple levels of compression that might be used at different times. The advantage there is that the same decompression algorithm works for all.

One might reasonably hope that decompression tables may be shared amongst multiple of the 64k raw blocks, to further squeeze usage.