Reducing the MTU will change the timing and also minimize the amount of data lost when packet start to disappear. But changing the MTU on the mTCP side won't help in this case, as the sender is using whatever they consider to be an appropriate MTU for them and mTCP is basically just sending back ACK packets.
mTCP has fragment support but getting fragments to appear is kind of rare. Back when networking hardware was more varied you could bump into a gateway that would fragment your packets, but that's not the case with the proliferation of Ethernet everywhere. (And devices that look like Ethernet.)
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