yeah have done, it seems to suffer from the same thing after you get ~4-5-6 links down the chain. like I said, it appears to be a stacking of the half-duplex-ness of the current wifi gear.

Have been able to minimise it by using mimo stuff as the bridge between the nodes effectively giving me ~108Mbps(so the marketing says) between the nodes and net connection, and "only" 11/54Mbps to the clients depending on what they are using.