Bonding problem

Hi there !

We have made a bonding with two routers connected by multi-point APs to increase the speed link;

                 /----AP1 --- AP2 --- AP3 ----\
LAN1 > R1--|                                         |--R2 < LAN2
                 \--- AP4 --- AP5 --- AP6 ----/

After follow this http://wiki.mikrotik.com/wiki/Bonding_Examples R1 can ping R2, and if we make a bridge with ether1 and bond1, we have connectivity on the LAN side, but the speed decreases a lot. I think without make a bridge, it can be better, but I don’t know how to make it to route traffic from ether1 to bond1 on both routers.

Any suggestion will be welcome.
Thanks in advance.