Looking at your topology and your concern I would recommend to have your ASA5510 inside interface participate in OSPF as well and have ASA5510 inject default route down stream to your OSPF neighbors which are your switches.
Your servers default gateway will be your defined HSRP ip address on your SVI interfaces in switches , if SW1 fails servers will continue connectivity provided by HSRP, and as indicated before your defaul route will be injected by ASA firewall via default information originate statement in ASA and continue outbound internet connectivity.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...