Since you're in Salt Lake area, I'm not sure what kind of spring you've had. If ti's been super wet, like it has here, soaking isn't goint to help.
After your farrier takes the excess length (usuall causes most of the cracks-too much growth) and you still think they are too dry....and it's not super wet in your area, soaking might help some.
I recommend Horseshoer's Secret, i see some good results with it-and a bonus is a lovely hair coat... for a supplement.
Resist the urge to put moisturizers on the hooves. At best, they don't work, and they can actually lead to more cracks (the oils in them trap moisture in the tiny cracks, but don't breathe, allowing yeast/fungus to set in, which create more weakness in the surface!)
You might find though, that after a good trim, the hooves aren't as bad as you think.