Well so far this firmware is running great! (though I'll probably jinx it now)
DNS Relay finally seems to work, and as usual I did not reload my previous configuration, rather I restored the defaults and then set it all up manually. SecureSpot downloaded my port forwarding stuff though once my Internet connection was up. I haven't bothered trying to disable SecureSpot and change my port forwarding though and to see if it saves properly. Also I don't and have never used Shareport.
I'm sitting at 1 day, 7 hours up time. I don't think it ever lasted that long with DNS Relay on before.