I also seem to be having this issue. Cannot get more than one tunnel to work. Have set all three policies to level=unique.
UPDATE: Actually it turns out my problem is more like the problem described below:
http://forum.mikrotik.com/t/site-to-site-vpn-can-only-establish-from-one-end/84091/1
I can establish a tunnel for the other subnets, but only if initiated from the Cisco ASA.