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From your email i under stand that, you have configured Load Balancer for High availability.
If your requirement is all about JUST high availability - I mean, no Session Replication is required, no JMS, no EJB, Replication/Fail Over is required, then you can go for Just Load balancer with 2 Managed server alone configuration. But, If you need all the mentioned stuff (session, JMS Failover, EJB failover, etc) then you have to go for Clustering. Its based on your requirements + your application design.
Only from load balancing point of view cluster is not really needed.
apart from session replication and failover capabilities, few more benefits are there with clustering only if you are using a web server also.
Stuck threads can be due to lot's of problems like application issues, load issues etc, So first make sure you are getting stuck thread on both servers or only on one, if on one, then in this case your load balancing not working properly and sending more load to that server, and if you are getting stuck threads on both then try to add one more managed server.