I've never used rice hulls and never had a stuck batch sparge using a SS braid on my ball valve.
1.25qt/lb is reasonable. between 1qt and 2qt per lb is the basic range.
You account for water absorption only in the mash...the grain will be saturated enough that the sparge water in will equal sparge water out.
.2 gallons per pound of grain is a good estimate for the loss.
Palmer's How to Brew is a good book. ProMash, BeerSmith, BeerTools...get one of these apps to help you with some of the math...it can get hectic even after several brews are under your belt.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10