Seed to ground contact is very important, I am not a fan of the rake and broadcast as you will waste at least 70% of the seed not getting cood soil contact. You also need to factor sunlight, most plants require at least 8 hours per day. Also how close are trees? Trees suck most of the nutrients from the soil.

Remember the saying...."If it sounds too good to be true, most times it is."

Agree with Dave when you "break" any ground you expose native seeds, spray at least twice before planting. If you choose to go ahead wait at least two weeks after spraying to scratch and plant seed, otherwise you risk tranferring the killer of choice into the soil.