If you are expecting to be top of the meters for both AoE or ST never going to be happy.
Choose one or the other.
Ret Paladin AoE is just fine when not even spec'd into the extra AoE talents.
Hitting 600k+ on AoE trash as ST spec is fine by me.
I mean on really big cheese AoE trash pulls I can hit over 3 million for a moment. (Im looking at you imps in VotW)