MPTCP aggregation – WAN1 not fully utilized (always ~50/50)

[slapshot]

Hello everyone, I'm asking what in the subject.

My setup:

• WAN1 (Fritzbox): potential 150–160 Mbit/s down, 20 up
• WAN2 (TIM Hub): potential 100–110 Mbit/s down, 20 up

What I observe

• Aggregated download: ~190 Mbit/s total.
• Traffic split is always ~50% / 50% → around 90–95 Mbit/s on each WAN.
• Even if WAN1 has clearly more capacity, OMR does not push it harder.
• Upload works fine (~37 Mbit/s total).

Tests already done

• MTU/MSS: confirmed real MTU = 1492, tried forcing it, no improvement.
• Weight: tried wan1.weight=2 vs wan2.weight=1, no effect.
• Low latency flag: enabling/disabling does not seem to change distribution.

My question
How can I configure OMR/MPTCP so that WAN1 (Fritz, higher capacity) is used more aggressively than WAN2?

Thanks for your help,
Antonio

[Ysurac]

Link are used based on RTT, weight is not used.