That sound's like a misprint. Overseeding at 3 Lbs. per K is just right.
You do know that if you seed in the fall (that would be Aug 15 for your area) your chance of success probably go's up 75%? This isn't just my opinion, it's a fact all across the US. Don't be fooled by the spring fever you see going on around you.
Why are you aerating? Unless you have a really bad compaction problem, you don't need to do that until fall.(the best time) If you do that now you will hurt the grass that's already growing. The soil just isn't warm enough to handle that kind of cultivation.
I'm glad your thinking a lot about this and making a plan. A nice yard doesn't just happen overnight. Good luck.