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There is probably a lot of other spots where air leakage is occurring. Draw a map of the house on the 2nd floor including all walls and light fixtures. then go up in the attic with your map and clean the insulation away from the light fixtures and foam them. Use your map to find the top plates (top of the walls below). clean the insulation off and you will find penetrations where wires go down into the wall. Seal those with spray foam. Do not foam anything that gets hot like a recessed light. Look for chimneys and seal around them with a fire proof material like fiberglass duct board and duct mastic. When you are done with all of this it then makes sense to bring the insulation up to 15 inches or so. If you don't airseal first it is a waste of money.
-James
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