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You have not shown that anything specific is broken. You have not even shown which process is consuming that memory.
Also, why would 90% resource usage be better than 60% resource usage? Resources are there to be used. Resources not used, are wasted. The issue is effective usage.
You need to IDENTIFY what is consuming resources - before blindly blaming Oracle RAC as using resources ineffectively, and/or leaking resources.
Each server had 16GB memory.Also check your PGA size.
MY SGA size on each node is 9GB.