bonding - quality problems

Hi

I want to bulid the bonding bridge including the stuff below

                  -------rb411     (wireless)       rb411-----
server------rb750(bonding)                               rb750(bonding)----(lan area)
                    -------rb411       (wireless)      rb411-----

i’ve made configuration written in wiki, (mode: balance rr). The connection between two rb’s750 works, test (bandwidth tests) between rb’s750 shows that connection can tramsmit more than 65Mbits in both ways. At first look - everything is great, but in closer look, the hosts in lan area acts unpredictably. Sometimes test (between lan area and serwer) show that connection is 2M/2M, sometimes 0.4M/2M (qos configured 8/2M - as you can see upload so OK, download to low, unpredictable).

bonding is made on ethernet connections, connected to rb411.
I have no problems with bandwidth in general. The connection between rb’s750 is almost unused, but still the unpredictable bandwith is the problem.

Help