One thing you need to add to the to do list is seal off any penetrations into the attic from romex to HVL's to the A/C vent's and can lighting.. It made a big difference in my house. No matter how good the insulation is if your blowing cold air into the attic your wasting money. I sealed all the receptacles and switches, first around the box and then with the foam insulators that go behind the plate. They sell them at Lowes or Home Depot. I changed out my old can lights with air tight's. Then went into the attic with spray foam and did all the top plates that had holes from cable to romex, then around the A/C vent's and then the HVL's. My HVL's were not vented out the house so I ducted them out the house so I don't have all that humidity blowing into the attic. Then found insulation on sale at Home Depot and put another layer over the original insulation. Got a little left to do but I'm almost finished! Hope this helps.
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