How to check the load balancing in Oracle 11gR2 2 node RAC

Dear All,
Can any one please assist me how to check whether the incoming connections are evenly distributing across the nodes..?
We have two nodes, when we check the sessions counts in both nodes, Most of the time we could see node -1 has more no of sessions than node-2..? So just wanted to know whether load balancing is happening or not ...? If not how to enable it and distribute the incoming connections evenly..?
Oracle 11gR2 / RHEL5

SQL> select inst_id,count(*) from gv$session where username is not null group by inst_id;
INST_ID COUNT(*)
1 43
2 40
Not sure how to check the users are connecting through scan or not ..? But below are scan setttings...
SQL> !srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
SQL> !srvctl status scan_listener
SCAN Listener LISTENER_SCAN1 is enabled
SCAN listener LISTENER_SCAN1 is running on node za-rac-prd-02
SCAN Listener LISTENER_SCAN2 is enabled
SCAN listener LISTENER_SCAN2 is running on node za-rac-prd-01
SCAN Listener LISTENER_SCAN3 is enabled
SCAN listener LISTENER_SCAN3 is running on node za-rac-prd-01
SQL> !srvctl config scan
SCAN name: rac_prd.abc.local, Network: 1/10.100.130.0/255.255.255.192/eth6.64
SCAN VIP name: scan1, IP: /rac_prd.abc.local/10.100.130.55
SCAN VIP name: scan2, IP: /rac_prd.abc.local/10.100.130.54
SCAN VIP name: scan3, IP: /rac_prd.abc.local/10.100.130.53
SQL>

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Mark, be my savior, I work for SUN as subcontractor at client site. the only one at site ...so I depend on this forum for solutions........
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**************LOGS**********************
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