At those speeds, you probably still have a large enough BDP per flow that TCP can respond appropriately. I'm testing at 512Kbps, where it's easy to get into single-packet BDPs.
A first-pass dynamic target adjustment is now pushed, and running here. It doesn't solve the problem completely, probably because it doesn't guarantee 4xMTU, only 1xMTU, but it looks like it might be beginning to help and I'm pretty sure it's the correct approach. Tuning it from here should be easy. - Jonathan Morton
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