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• Type and factory must reference the UCP driver.
• Actual timeout values will be environment specific. I would start with the defaults(not setting them) and then increase as needed.
• Set CONNECT_TIMEOUT to a high value to prevent logon storms.
• DO NOT use RETRY_COUNT without RETRY_DELAY
• Set LOAD_BALANCE= ON per ADDRESS_LIST to balance SCANs 
• Use one DESCRIPTION and more than one causes long delays 

References

• https://www.oracle.com/technetwork/database/application-development/planned-unplanned-rlb-ucp-tomcat-2265175.pdf
• https://www.oracle.com/technetwork/database/enterprise-edition/ucp-transition-guide-129515.pdf
• https://docs.oracle.com/cd/E11882_01/java.112/e12265/connect.htm#CHDEEIJE