Hi,
If you are looking for some more command to check for the throughput through the module:-
show firewall module <number> traffic
Also , I think as this is End of life , you might have to check for some old documentation from Cisco on the best practices.
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/prod_white_paper0900aecd805457cc.html
https://supportforums.cisco.com/discussion/11540181/ask-expertconfiguring-troubleshooting-best-practices-asa-fwsm-failover
Thanks and Regards,
Vibhor Amrodia