iperf tests also confirm CA is working:

RU1 alone:  dl ~ 33    Mbit/s (MCS is low ~ 11, many retx)
RU2 alone:  dl ~ 50-60 Mbit/s (MCS better, but still not good: ~ 16-19, many retx)

RU1+RU2:    dl ~ 100-110 Mbit/s