This can probably be made into 4R by building a berlo-free 8R pipeline to the right of berlo if I really find no other latency 9 pipelines to glue together. The imaginary 4R might even have interesting latency considerations (e.g. it starts so slow that it doesn't beat this 9 [6] and I need to drip feed its first two quints so it gets to like 9 6 6 5 3 5 3 and then I face looping problems).
Also arm 2 can be made a piston sitting between calcifiers to shave 1 area and watch water and earth swooshing around it.