Don't forget the additional 80% you can get from Stand Against the Tide, as well as big bursts from Intolerant Blows. You'll be fine with the amount of threat gen. Mine has 12 fighter - so no 100% from divine righteousness - and I've not had problems keeping aggro against almost anyone.
I am assuming that you will have good gear (DR breakers of course, but also bursted ToD rings, and the like), so your DPS will be pretty good. If you don't have the gear then you can always ask for an extra 30 seconds to get aggro in most cases. Sometimes people even listen.