Hi V,
What might be happening with the irises is that if they are hybrids, I think they can drift back to the dominant strain over time. I don't recall exactly what plant I've seen this happen with.
For better flowering I think phosphorus is what you want to fertilize with (and I think bone meal would be a high P choice).
It is only the cynic who claims “to speak the truth” at all times and in all places to all men in the same way, but who, in fact, displays nothing but a lifeless image of the truth… He dons the halo of the fanatical devotee of truth who can make no allowance for human weaknesses; but, in fact, he is destroying the living truth between men. He wounds shame, desecrates mystery, breaks confidence, betrays the community in which he lives, and laughs arrogantly at the devastation he has wrought and at the human weakness which “cannot bear the truth”. Dietrich Bonhoeffer, in Ethics.
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