Beersmith is pretty accurate, but if you are making beer that you like, the numbers don't really matter. You can adjust the steeping time, late extract addition, and hop AA% stats to match up with your method, and my experience has been pretty accurate.
I don't know if your book takes late extract addition into account or not, but if it doesn't and you want to keep up with that method, I would adjust the hops to what Beersmith says.
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