How much is the optimal thickness? How "packed" should it be? I just took the BR600 to the lawn, and noticed a LOT of very hardpacked areas with 2" of thatch. The grass was growing around these areas and masking them where no grass was growing because of the thatch. Should I have my lawn de-thatched and start mulching from scratch next spring, or just blow these spots loose, aerate, seed, and go from there? Sorry if this is a basic question!