Did you seal all penetrations to the attic before adding insulation? If not, sealing attic air leaks is more important than most people realize.
There is (almost) no such thing as too much insulation in an attic. My previous house had R60 insulation in the attic, and it really made a difference when we had several days of 100+ deg F temperatures. So I had the attic of our current house insulated to R96.
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