I believe that F2FS should improve plotting, I didn’t test my speed with other filesystems though since the performance as appears on many benchmarks are a lot better than the default ext4 (it’s not even close). It’s comparable to XFS but without having to specify any mount option to make your SSD performs fast. It’s the filesystem that’s built specifically for SSD from the ground up.
I have tried a greater value of -r, but I found that -r 16 gives me the best result.