I have beersmith as well, I learned no matter what to always aim 1.5 gallons above what it tells you for sparge water. As long as you do that and ONLY lauter what beersmith says so and you wont have a problem hitting your gravity.
"Relax, dont worry, have a homebrew." -Charlie Papazian
"A friend with yeast is a friend indeed."
"Beer is proof that God loves us and wants us to be happy." -Benjamin Franklin