StaticMembers within Multiple Clusters

[Tim K]

I'm trying to split 4 separate tomcat instances into 2 clusters (2x2) to
try and avoid the all-to-all traffic, but even when setting up the Receiver
and Static members to only speak to 1 other instance, some still seems to
find and add the other members outside of the defined config to the wrong
cluster.  I read that mcast is still used when you have StaticMembers,
could that be causing this issue?