The network seems much quicker this week after the latest antnode has propagated wider. I got some impressive results from lots of smaller files too, which illustrates the strides forward with lowering latency.
I found that 32 - 64 chunks work well for me too, but 16 gives maximum reliability. That’s over a relatively busy connection + wifi though. Tbh, 16 isn’t much slower than 32 for me either, mind.