First is update firmware to latest long term version.
The would remove all the extra bridges and use ONLY one bridge.
I would use Vlans to separate subnets.
I would add vlans to the one single bridge.
I would assign brigde port interfaces appropriately (ingress trunk or access ports)
I would assign bridge vlans appropriately (egress rules)
All laid out on this thread (what you have seems all over the map)
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
Not sure what your attempting but see some emphasis on black hole entries?? Would remove all of it and focus on needed functionality first and get it working.
FW rules need to be cleaned up…